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UNITEDSTATES
SECURITIESANDEXCHANGECOMMISSION
Washington,D.C.20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-07080

Name of Fund: BlackRock MuniYield Michigan Insured Fund, Inc. (MIY)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Anne F. Ackerley, Chief Executive Officer, BlackRock
MuniYield Michigan Insured Fund, Inc., 55 East 52nd Street, New York, NY 10055.

Registrant’s telephone number, including area code: (800) 882-0052, Option 4

Date of fiscal year end: 07/31/2010

Date of reporting period: 04/30/2010

Item 1 – Schedule of Investments

Schedule of Investments April 30, 2010 (Unaudited)

BlackRock MuniYield Michigan Insured Fund, Inc. (MIY)
(Percentages shown are based on Net Assets)

     Par   
Municipal Bonds    (000)  Value 
Michigan — 140.5%       
Corporate — 12.5%       
Delta County EDC, Refunding RB, Mead     
   Westvaco-Escanaba, Series B, AMT,     
   6.45%, 4/15/23 (a)  $ 1,500  $ 1,664,055 
Dickinson County EDC Michigan,       
   Refunding RB, International Paper Co.     
   Project, Series A, 5.75%, 6/01/16    3,900  4,005,261 
Michigan Strategic Fund, Refunding RB,     
   Detroit Edison Co. Project, Series A,       
   AMT (NPFGC), 5.55%, 9/01/29    10,250  10,212,998 
Monroe County EDC Michigan,       
   Refunding RB, Detroit Edison Co.       
   Project, Series AA (NPFGC), 6.95%,       
   9/01/22    15,000  17,471,400 
      33,353,714 
County/City/Special District/School District — 48.5%   
Adrian City School District Michigan, GO     
   (AGM) (a):       
       5.00%, 5/01/29    2,000  2,281,000 
       5.00%, 5/01/34    1,600  1,824,800 
Avondale School District Michigan, GO     
   (AGC):       
       4.00%, 5/01/20    1,000  985,410 
       4.30%, 5/01/22    400  398,032 
Bay City School District Michigan, GO,       
   School Building & Site (AGM), 5.00%,     
   5/01/36    9,000  9,163,350 
Birmingham City School District       
   Michigan, GO, School Building & Site     
   (AGM), 5.00%, 11/01/33    1,000  1,023,450 
Charter Township of Canton Michigan,     
   GO, Capital Improvement (AGM):       
       5.00%, 4/01/25    1,840  1,923,039 
       5.00%, 4/01/26    2,000  2,080,520 
       5.00%, 4/01/27    500  525,625 
City of Oak Park Michigan, GO, Street       
   Improvement (NPFGC), 5.00%,       
   5/01/30    500  513,285 
County of Genesee Michigan, GO, Water     
   Supply System (NPFGC), 5.13%,       
   11/01/33    1,000  1,009,400 
County of Wayne Michigan, GO (NPFGC):     
       Airport Hotel, Detroit Metropolitan     
Airport, Series A, 5.00%, 12/01/30  1,750  1,604,558 
       Building Authority, Capital       
       Improvement, Series A, 5.25%,       
       6/01/16    1,000  1,003,610 

     Par   
Municipal Bonds    (000)  Value 
Michigan (continued)       
County/City/Special District/School District (continued)   
Dearborn Brownfield Redevelopment       
   Authority, GO, Limited Tax,       
   Redevelopment, Series A (AGC),       
   5.50%, 5/01/39  $ 3,300   $ 3,462,327 
Detroit City School District Michigan, GO     
   (FGIC), School Building & Site       
   Improvement:       
       Series A, 5.38%, 5/01/24 (a)    1,300  1,455,389 
       Series B, 5.00%, 5/01/28    3,100  3,056,569 
Detroit City School District Michigan,       
   GO, Refunding, School Building & Site     
   Improvement, Series A (AGM), 5.00%,     
   5/01/21    3,000  3,062,880 
Eaton Rapids Public Schools Michigan,     
   GO, School Building & Site (AGM):       
       5.25%, 5/01/20    1,325  1,429,476 
       5.25%, 5/01/21    1,675  1,808,749 
Ecorse Public School District Michigan,     
   GO, Refunding (AGM), 5.00%,       
   5/01/27    1,000  1,029,850 
Gibraltar School District Michigan, GO,     
   School Building & Site:       
       (FGIC), 5.00%, 5/01/28 (a)    2,940  3,344,456 
       (NPFGC), 5.00%, 5/01/28    710  723,128 
Grand Blanc Community Schools       
   Michigan, GO (NPFGC), 5.63%,       
   5/01/20    1,100  1,160,434 
Grand Rapids Building Authority,       
   Michigan, RB, Series A (AMBAC) (a):     
       5.50%, 10/01/19    435  482,780 
       5.50%, 10/01/20    600  665,904 
Grand Rapids Public Schools, Michigan,     
   GO, School Building & Site (AGM),       
   4.13%, 5/01/11    500  516,605 
Gull Lake Community School District       
   Michigan, GO, School Building & Site     
   (AGM) (a):       
       5.00%, 5/01/28    2,000  2,281,000 
       5.00%, 5/01/30    3,625  4,134,313 
Harper Creek Community School District     
   Michigan, GO, Refunding (AGM),       
   5.00%, 5/01/22    1,125  1,189,575 

Portfolio Abbreviations

To simplify the listings of portfolio holdings in the Schedule of Investments, the names and descriptions of many of the securities have been abbreviated
according to the following list:

ACA  American Capital Access Corp.  FGIC  Financial Guaranty Insurance Co. 
AGC  Assured Guaranty Corp.  GAN  Grant Anticipation Notes 
AGM  Assured Guaranty Municipal Corp.  GNMA  Government National Mortgage Association 
AMBAC  American Municipal Bond Assurance Corp.  GO  General Obligation Bonds 
AMT  Alternative Minimum Tax (subject to)  HDA  Housing Development Authority 
CAB  Capital Appreciation Bonds  NPFGC  National Public Finance Guarantee Corp. 
COP  Certificates of Participation  RB  Revenue Bonds 
EDC  Economic Development Corp.     

BLACKROCK MUNIYIELD MICHIGAN INSURED FUND, INC.

APRIL 30, 2010

1

Schedule of Investments (continued)

BlackRock MuniYield Michigan Insured Fund, Inc. (MIY)
(Percentages shown are based on Net Assets)

     Par   
Municipal Bonds    (000)  Value 
Michigan (continued)       
County/City/Special District/School District (continued)   
Harper Woods School District Michigan,     
   GO, Refunding, School Building &       
   Site:       
       (FGIC), 5.00%, 5/01/34 (a)  $ 4,345  $ 4,955,472 
       (NPFGC), 5.00%, 5/01/34    430  433,874 
Jenison Public Schools Michigan, GO,       
   Building & Site (NPFGC), 5.50%,       
   5/01/19    1,575  1,683,880 
L'Anse Creuse Public Schools, Michigan,     
   GO, School Building & Site (AGM):       
       5.00%, 5/01/12    650  695,747 
       5.00%, 5/01/24    1,000  1,040,930 
       5.00%, 5/01/25    1,525  1,583,011 
       5.00%, 5/01/26    1,600  1,653,568 
       5.00%, 5/01/35    3,000  3,057,120 
Lansing Building Authority, Michigan,       
   GO, Series A (NPFGC), 5.38%,       
   6/01/23 (a)    1,510  1,705,470 
Lincoln Consolidated School District       
   Michigan, GO, Refunding (NPFGC),       
   4.63%, 5/01/28    5,500  5,510,010 
Livonia Public Schools School District       
   Michigan, GO, Refunding, Series A       
   (NPFGC), 5.00%, 5/01/24    1,000  1,034,140 
Michigan State Building Authority,       
   Facilities, Series I:       
       5.50%, 10/15/18    2,355  2,466,533 
       5.50%, 10/15/18 (a)    145  155,082 
Michigan State Building Authority, RB,     
   Facilities Program, Series H (AGM),       
   5.00%, 10/15/26    4,500  4,571,100 
Michigan State Building Authority,       
   Refunding RB, Facilities Program,       
   Series I (AGM):       
       5.50%, 10/15/10 (b)    420  430,055 
       5.50%, 10/15/10    4,330  4,428,637 
       5.50%, 10/15/11 (b)    855  916,192 
       5.50%, 10/15/11    14,175  15,076,672 
Montrose Community Schools, GO       
   (NPFGC), 6.20%, 5/01/17    1,000  1,166,940 
New Haven Community Schools,       
   Michigan, GO, Refunding, School       
   Building & Site (AGM), 5.00%,       
   5/01/23    1,500  1,572,255 
Orchard View Schools, Michigan, GO,       
   School Building & Site (NPFGC),       
   5.00%, 5/01/29 (a)    5,320  6,011,440 
Pennfield School District Michigan, GO,     
   School Building & Site (a):       
       (FGIC), 5.00%, 5/01/29    765  868,642 
       (NPFGC), 5.00%, 5/01/29    605  686,965 
Reed City Public Schools, Michigan, GO,     
   School Building & Site (AGM), 5.00%,     
   5/01/26 (a)    1,425  1,625,213 

     Par   
Municipal Bonds    (000)  Value 
Michigan (continued)       
County/City/Special District/School District (concluded)   
Southfield Public Schools, Michigan, GO,     
   School Building & Site, Series B       
   (AGM), 5.00%, 5/01/29 (a)  $ 3,500  $ 3,965,430 
Thornapple Kellogg School District,       
   Michigan, GO, School Building & Site     
   (NPFGC), 5.00%, 5/01/32    2,500  2,547,300 
Van Dyke Public Schools, Michigan, GO,     
   School Building & Site (AGM), 5.00%,     
   5/01/28    1,250  1,300,138 
West Bloomfield School District,       
   Michigan, GO, Refunding (NPFGC):       
       5.50%, 5/01/17    1,710  1,828,212 
       5.50%, 5/01/18    1,225  1,309,684 
Zeeland Public Schools Michigan, GO,     
   School Building & Site (NPFGC),       
   5.00%, 5/01/29    1,600  1,627,248 
      130,046,474 
Education — 6.5%       
Eastern Michigan University, RB,       
   General, Series B (FGIC) (a):       
       5.60%, 6/01/25    1,000  1,004,530 
       5.63%, 6/01/30    1,310  1,315,961 
Eastern Michigan University, Refunding     
   RB, General (AMBAC):       
       6.00%, 6/01/20    435  440,803 
       6.00%, 6/01/20 (a)    590  598,803 
Grand Valley State University, Michigan,     
   RB, General (NPFGC), 5.50%,       
   2/01/18    2,070  2,268,679 
Michigan Higher Education Facilities       
   Authority, RB, Limited Obligation,       
   Hillsdale College Project, 5.00%,       
   3/01/35    1,875  1,787,737 
Michigan Higher Education Facilities       
   Authority, Refunding RB, Limited       
   Obligation, Creative Studies (a):       
       5.85%, 12/01/22    1,235  1,358,611 
       5.90%, 12/01/27    1,145  1,260,782 
Michigan Higher Education Student       
   Loan Authority, RB, AMT (AMBAC),       
   Student Loan:       
       Series XVII-B, 5.40%, 6/01/18    2,500  2,501,325 
       Series XVII-Q, 5.00%, 3/01/31    3,000  2,811,570 
Saginaw Valley State University,       
   Michigan, Refunding RB, General       
   (NPFGC), 5.00%, 7/01/24    2,100  2,153,823 
      17,502,624 
Health — 21.5%       
Dickinson County Healthcare System,       
   Refunding RB, Series A (ACA), 5.80%,     
   11/01/24    3,100  3,020,020 

2 BLACKROCK MUNIYIELD MICHIGAN INSURED FUND, INC.

APRIL 30, 2010

Schedule of Investments (continued)

BlackRock MuniYield Michigan Insured Fund, Inc. (MIY)
(Percentages shown are based on Net Assets)

     Par   
Municipal Bonds    (000)  Value 
Michigan (continued)       
Health (continued)       
Flint Hospital Building Authority       
   Michigan, Refunding RB (ACA), Hurley     
   Medical Center:       
       6.00%, 7/01/20  $ 1,305  $ 1,279,618 
       Series A, 5.38%, 7/01/20    615  574,275 
Kent Hospital Finance Authority,       
   Michigan, RB, Spectrum Health,       
   Series A (NPFGC), 5.50%,       
   1/15/31 (a)    3,000  3,205,950 
Kent Hospital Finance Authority       
   Michigan, Refunding RB, Butterworth,     
   Series A (NPFGC), 7.25%,       
   1/15/13 (b)    1,955  2,118,555 
Michigan State Hospital Finance       
   Authority, RB:       
       Ascension Health Senior Credit       
       Group, 5.00%, 11/15/25    3,700  3,848,000 
       Hospital, MidMichigan Obligation       
       Group, Series A (AMBAC), 5.50%,       
       4/15/18    2,530  2,584,952 
       McLaren Health Care, Series C,       
       5.00%, 8/01/35    1,000  932,100 
       MidMichigan Obligation Group,       
       Series A, 5.00%, 4/15/36    1,750  1,655,167 
Michigan State Hospital Finance       
   Authority, Refunding RB:       
       Henry Ford Health System, Series A,     
       5.25%, 11/15/46    2,500  2,280,275 
       Hospital, Crittenton, Series A,       
       5.63%, 3/01/27    2,050  2,031,140 
       Hospital, Oakwood Obligation       
       Group, Series A, 5.00%, 7/15/25    3,860  3,723,819 
       Hospital, Oakwood Obligation       
       Group, Series A, 5.00%, 7/15/37    630  555,143 
       Hospital, Sparrow Obligated, 5.00%,     
       11/15/31    3,100  2,924,323 
       McLaren Health Care, 5.75%,       
       5/15/38    4,500  4,607,415 
       Trinity Health Credit, Series C,       
       5.38%, 12/01/23    1,000  1,013,780 
       Trinity Health Credit, Series C,       
       5.38%, 12/01/30    3,755  3,752,484 
       Trinity Health Credit, Series D,       
       5.00%, 8/15/34    3,100  3,006,473 
       Trinity Health, Series A, 6.00%,       
       12/01/20    2,200  2,246,640 
       Trinity Health, Series A, 6.25%,       
       12/01/28    930  1,028,757 
       Trinity Health, Series A, 6.50%,       
       12/01/33    1,000  1,114,700 
       Trinity Health, Series A (AMBAC),       
       6.00%, 12/01/27 (a)    6,310  6,426,041 
       Trinity Health, Series A (AMBAC),       
       6.00%, 12/01/27    90  93,621 

   Par   
Municipal Bonds  (000)  Value 
Michigan (continued)     
Health (concluded)     
Royal Oak Hospital Finance Authority     
   Michigan, Refunding RB, William     
   Beaumont Hospital, 8.25%, 9/01/39 $  1,000  $ 1,180,330 
Saginaw Hospital Finance Authority     
   Michigan, Refunding RB, Covenant     
   Medical Center, Series E (NPFGC),     
   5.63%, 7/01/13  2,500  2,511,025 
    57,714,603 
Housing — 4.5%     
Michigan State HDA, RB:     
       Deaconess Tower, AMT (GNMA),     
       5.25%, 2/20/48  1,000  1,005,680 
       Series A, 6.00%, 10/01/45  6,990  7,222,627 
       Series A, AMT (NPFGC), 5.30%,     
       10/01/37  130  130,178 
       Williams Pavilion, AMT (GNMA),     
       4.75%, 4/20/37  3,925  3,758,070 
    12,116,555 
State — 11.5%     
Michigan Municipal Bond Authority, RB,     
   Local Government Loan Program,     
   Group A (AMBAC), 5.50%, 11/01/20  1,065  1,062,902 
Michigan Municipal Bond Authority,     
   Refunding RB, Local Government,     
   Charter County Wayne, Series B     
   (AGC):     
       5.00%, 11/01/14  2,400  2,644,344 
       5.00%, 11/01/15  1,500  1,632,480 
       5.00%, 11/01/16  500  549,075 
       5.38%, 11/01/24  125  135,189 
Michigan State Building Authority,     
   Refunding RB:     
       Facilities Program, Series I, 6.25%,     
       10/15/38  3,900  4,292,106 
       Facilities Program, Series I (AGC),     
       5.25%, 10/15/24  4,000  4,268,320 
       Facilities Program, Series I (AGC),     
       5.25%, 10/15/25  2,000  2,119,220 
       Facilities Program, Series I (AGC),     
       5.25%, 10/15/26  600  631,980 
       Facilities Program, Series II     
       (NPFGC), 5.00%, 10/15/29  3,500  3,516,450 
       Series IA (NPFGC), 5.00%,     
       10/15/32  2,500  2,502,675 
State of Michigan, COP (AMBAC), 5.53%,     
   6/01/22 (b)(c)  3,000  1,873,860 
State of Michigan, RB, GAN (AGM),     
   5.25%, 9/15/27  5,250  5,501,212 
    30,729,813 
Transportation —16.7%     
County of Wayne Michigan, RB, Detroit     
   Metropolitan, Wayne County, Series A,     
   AMT (NPFGC), 5.38%, 12/01/15  10,660  10,787,174 

BLACKROCK MUNIYIELD MICHIGAN INSURED FUND, INC.

APRIL 30, 2010

3

Schedule of Investments (continued)

BlackRock MuniYield Michigan Insured Fund, Inc. (MIY)
(Percentages shown are based on Net Assets)

  Par   
Municipal Bonds  (000)             Value 
Michigan (concluded)     
Transportation (concluded)     
Wayne County Airport Authority, RB,     
   Detroit Metropolitan Wayne County     
   Airport, AMT (NPFGC):     
       5.25%, 12/01/25  $ 7,525  $ 7,200,371 
       5.25%, 12/01/26  6,300  5,920,929 
       5.00%, 12/01/34  9,160  7,751,192 
Wayne County Airport Authority,     
   Refunding RB, AMT (AGC):     
       5.75%, 12/01/25  4,000  4,056,560 
       5.75%, 12/01/26  1,000  1,006,670 
       5.38%, 12/01/32  8,700  8,082,387 
    44,805,283 
Utilities — 18.8%     
City of Detroit Michigan, RB:     
       Second Lien, Series B (AGM),     
       7.00%, 7/01/36  3,000  3,455,790 
       Second Lien, Series B (NPFGC),     
       5.00%, 7/01/34  2,420  2,347,182 
       Second Lien, Series B (NPFGC),     
       5.00%, 7/01/34 (a)  1,550  1,727,986 
       Senior Lien, Series A (AGM), 5.00%,     
       7/01/25  4,000  4,037,760 
       Senior Lien, Series A (FGIC), 5.75%,     
       7/01/28 (a)  5,250  5,596,133 
       Senior Lien, Series A (NPFGC),     
       5.00%, 7/01/34  6,900  6,692,379 
       Series B (NPFGC), 5.25%,     
       7/01/32 (a)  11,790  13,235,100 
City of Detroit Michigan, Refunding RB:     
       (FGIC), 6.25%, 7/01/12 (b)  860  906,758 
       Second Lien, Series C (AGM),     
       5.00%, 7/01/29  10,570  10,613,760 
City of Muskegon Heights Michigan, RB,     
   Series A (NPFGC), 5.63%,     
   11/01/25 (a)  1,830  1,879,209 
    50,492,057 
Total Municipal Bonds in Michigan    376,761,123 
Puerto Rico — 4.7%     
Housing — 0.8%     
Puerto Rico Housing Finance Authority,     
   Refunding RB, Subordinate, Capital     
   Fund Modernization, 5.13%,     
   12/01/27  2,000  1,996,460 
State — 2.3%     
Puerto Rico Public Buildings Authority,     
   Refunding RB, Government Facilities,     
   Series M-3 (NPFGC), 6.00%, 7/01/27  2,100  2,219,070 
Puerto Rico Sales Tax Financing Corp.,     
   Refunding RB, CAB, Series A     
   (NPFGC) (c):     
       5.19%, 8/01/43  12,500  1,719,125 

  Par   
Municipal Bonds  (000)  Value 
Puerto Rico (concluded)     
State (concluded)     
Puerto Rico Sales Tax Financing Corp.,     
   Refunding RB (concluded):     
    4.99%, 8/01/46  $ 20,000  $ 2,236,000 
    6,174,195 
Transportation — 1.6%     
Puerto Rico Highway & Transportation     
   Authority, Refunding RB, Series CC     
   (AGC), 5.50%, 7/01/31  4,000  4,352,560 
Total Municipal Bonds in Puerto Rico    12,523,215 
Total Municipal Bonds – 145.2%                                             389,284,338
Municipal Bonds Transferred to Tender     
Option Bond Trusts (d)     
Michigan — 12.0%     
Corporate — 4.7%     
Wayne State University, Refunding RB,     
   General (AGM), 5.00%, 11/15/35  12,210  12,621,233 
County/City/Special District/School District — 2.6%   
Lakewood Public Schools Michigan, GO,     
   School Building & Site (AGM), 5.00%,     
   5/01/37  6,470  6,959,650 
Education — 4.7%     
Portage Public Schools Michigan, GO,     
   School Building & Site (AGM), 5.00%,     
   5/01/31  4,650  4,811,122 
Saginaw Valley State University,     
   Refunding RB, General (AGM), 5.00%,     
   7/01/31  7,500  7,743,150 
    12,554,272 
Total Municipal Bonds Transferred to     
Tender Option Bond Trusts – 12.0%    32,135,155 
Total Long-Term Investments     
(Cost – $412,472,453) – 157.2%                                         421,419,493
Short-Term Securities  Shares   
CMA Michigan Municipal Money Fund,     
   0.00% (e)(f)  1,839,237  1,839,237 
Total Short-Term Securities     
(Cost – $1,839,237) – 0.7%    1,839,237 

4 BLACKROCK MUNIYIELD MICHIGAN INSURED FUND, INC.

APRIL 30, 2010

Schedule of Investments (concluded)

BlackRock MuniYield Michigan Insured Fund, Inc. (MIY)

(Percentages shown are based on Net Assets)

  Value 
Total Investments   
(Cost – $414,311,690*) – 157.9%  $ 423,258,730 
Other Assets Less Liabilities – 2.1%  5,614,944 
Liability for Trust Certificates, Including Interest   
   Expense and Fees Payable – (6.0)%  (16,209,238) 
Preferred Shares, at Redemption Value – (54.0)%  (144,664,302) 
Net Assets Applicable to Common Shares – 100.0%  $ 268,000,134 

* The cost and unrealized appreciation (depreciation) of investments as of

April 30, 2010, as computed for federal income tax purposes, were as

Aggregate follows: cost  $ 401,073,918 
Gross unrealized appreciation  $ 15,718,104 
Gross unrealized depreciation  (9,723,292) 
Net unrealized appreciation  $ 5,994,812 

(a) US government securities, held in escrow, are used to pay interest on this
security as well as to retire the bond in full at the date indicated, typically
at a premium to par.
(b) Security is collateralized by Municipal or US Treasury obligations.
(c) Represents a zero-coupon bond. Rate shown reflects the current yield as
of report date.
(d) Securities represent bonds transferred to a tender option bond trust in
exchange for which the Fund acquired residual interest certificates.
These securities serve as collateral in a financing transaction.
(e) Investments in companies considered to be an affiliate of the Fund during
the period, for purposes of Section 2(a)(3) of the Investment Company Act
of 1940, were as follows:
______________________________________________________________________________________________________________________________________________________________________________________________________________

  Shares Held    Shares Held 
  at July 31,  Net  at April 30, 
  Affiliate                               2009                                               Activity                                                    2010                   Income
  CMA Michigan     
  Municipal     
   Money Fund                     7,530,323                                     (5,691,086)                                              1,839,237              $958
(f)  Represents the current yield as of report date.   

• Fair Value Measurements – Various inputs are used in determining the fair
value of investments, which are as follows:

• Level 1 — price quotations in active markets/exchanges for identical
assets and liabilities

• Level 2 — other observable inputs (including, but not limited to: quoted
prices for similar assets or liabilities in markets that are active, quoted
prices for identical or similar assets or liabilities in markets that are not
active, inputs other than quoted prices that are observable for the
assets or liabilities (such as interest rates, yield curves, volatilities,
prepayment speeds, loss severities, credit risks and default rates) or
other market-corroborated inputs)

• Level 3 — unobservable inputs based on the best information available
in the circumstances, to the extent observable inputs are not available
(including the Fund’s own assumptions used in determining the fair
value of investments)

The inputs or methodologies used for valuing securities are not necessarily
an indication of the risk associated with investing in those securities. For
information about the Fund’s policy regarding valuation of investments and
other significant accounting policies, please refer to the Fund’s most recent
financial statements as contained in its semi-annual report.

The following table summarizes the inputs used as of April 30, 2010 in
determining the fair valuation of the Fund’s investments:
Investments in Securities

Valuation Inputs  Level 1  Level 2  Level 3  Total 
Assets:         
Long-Term         
   Investments1  —                   $ 421,419,493         —       $ 421,419,493 
Short-Term         
   Securities  $ 1,839,237  —  —  1,839,237 
Total  $ 1,839,237           $ 421,419,493       —        $ 423,258,730 

1 See above Schedule of Investments for values in each sector.

BLACKROCK MUNIYIELD MICHIGAN INSURED FUND, INC.

APRIL 30, 2010

5

Item 2 – Controls and Procedures

2(a) – The registrant's principal executive and principal financial officers or persons performing
similar functions have concluded that the registrant's disclosure controls and procedures (as
defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the
“1940 Act”)) are effective as of a date within 90 days of the filing of this report based on the
evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act
and Rule 13(a)-15(b) under the Securities Exchange Act of 1934, as amended.

2(b) – There were no changes in the registrant's internal control over financial reporting (as defined
in Rule 30a-3(d) under the 1940 Act) that occurred during the registrant's last fiscal quarter
that have materially affected, or are reasonably likely to materially affect, the registrant's
internal control over financial reporting.

Item 3 – Exhibits

Certifications – Attached hereto

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by
the undersigned, thereunto duly authorized.

BlackRock MuniYield Michigan Insured Fund, Inc.

By: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer of
BlackRock MuniYield Michigan Insured Fund, Inc.

Date: June 28, 2010

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, this report has been signed below by the following persons on behalf
of the registrant and in the capacities and on the dates indicated.

By: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer (principal executive officer) of
BlackRock MuniYield Michigan Insured Fund, Inc.

Date: June 28, 2010

By: /s/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock MuniYield Michigan Insured Fund, Inc.

Date: June 28, 2010