ADMINISTRATION AGREEMENT
         This ADMINISTRATION AGREEMENT, made as of the 17th day of July 2003
among PIONEER MUNICIPAL HIGH INCOME TRUST, a Delaware statutory trust (the
"Trust"), PIONEER INVESTMENT MANAGEMENT, INC., a Delaware corporation ("PIM"),
and PRINCETON ADMINISTRATORS, L.P., a Delaware limited partnership (the
"Administrator").
                                   WITNESSETH:
         WHEREAS, the Trust is a diversified closed-end management investment
company registered under the Investment Company Act of 1940, as amended (the
"Investment Company Act"); and
         WHEREAS, the Trust and PIM are entering into an Advisory Agreement
pursuant to which PIM will provide investment advice to the Trust and be
responsible for the portfolio management of the Trust; and
         WHEREAS, the Trust wishes to retain the Administrator and PIM to
perform the administrative services contemplated by this Agreement to the Trust.
         NOW, THEREFORE, the parties hereto agree as follows:
1.       DUTIES OF THE ADMINISTRATOR. The Trust hereby retains the Administrator
         to act as administrator of the Trust, subject to the supervision and
         directions of the Board of Trustees of the Trust as herein set forth.
         Subject to the supervision and direction of PIM, the Administrator
         shall perform or arrange for the performance of the following
         administrative and clerical services:
(a)               Calculate or arrange for the calculation and publication of
                  the Trust's net asset value in accordance with the Trust's
                  policy as adopted from time to time by the Board of Trustees;
(b)               Maintain, or arrange for the maintenance of, certain books and
                  records of the Trust, as mutually agreed upon between the
                  parties hereto, that are required under the Investment Company
                  Act;
(c)               Provide the Trust with administrative offices and data
                  processing facilities as well as the services of persons
                  competent to perform such administrative and clerical
                  functions as are necessary to provide effective operation of
                  the Trust;
(d)               Maintain the Trust's expense budget and monitor expense
                  accruals;
(e)               Arrange for payment of the Trusts' expenses, as PIM directs,
                  which may include calculation of various contractual expenses
                  of the Trust's service providers, and the review and approval
                  of invoices for the Trust's account and submission to a Trust
                  officer for authorization of payment in a manner to be agreed
                  upon;
(f)               Oversee and review calculations of fees paid to the
                  Administrator, PIM, the transfer agent and the custodian;
(g)               Compute the Trust's yield, total return, expense ratios and
                  portfolio turnover rate as well as various Trust statistical
                  data as reasonably requested;
(h)               Prepare, for review and approval by officers of the Trust,
                  financial information for the Trust's semi-annual and annual
                  reports, proxy statements and other communications with
                  shareholders required or otherwise to be sent to Trust
                  shareholders, and arrange for the printing and dissemination
                  of such reports and communications to shareholders;
(i)               Prepare reports relating to the business and affairs of the
                  Trust as may be mutually agreed upon and not otherwise
                  appropriately prepared by PIM or the Trust's custodian,
                  counsel or auditors;
(j)               Prepare, or arrange for preparation for review, approval and
                  execution by officers of the Trust, the Trust's federal, state
                  and local income tax returns, and any other required tax
                  returns, as may be mutually agreed upon;
(k)               Calculate the Trust's annual net investment income (including
                  net realized short-term capital gain) and net realized
                  long-term capital gain to determine the Trust's minimum annual
                  distributions to shareholders and the tax and accounting
                  treatment of such distributions on a per share basis, to be
                  reviewed by the Trust's independent public accountants;
(l)               Prepare for review by an officer of the Trust the Trust's
                  periodic financial reports required to be filed with the
                  Securities and Exchange Commission (the "SEC") on Form N-CSR
                  and Form N-2 and such other reports, forms or filings, as may
                  be mutually agreed upon;
(m)               Prepare such financial information and reports as may be
                  required by any stock exchange or exchanges on which the
                  Trust's shares are listed, and such other information and
                  reports required by such stock exchanges as may be mutually
                  agreed upon;
(n)               Prepare such financial information and reports as may be
                  required by any banks from which the Trust borrows funds;
(o)               Prepare reports related to the Trust's preferred stock, if
                  any, as required by rating agencies;
(p)               Assist in the preparation and filing of Forms 3, 4 and 5
                  pursuant to Section 16 of the Securities Exchange Act of 1934
                  and Section 30(f) of the Investment Company Act for the
                  officers and trustees of the Trust, such filings to be based
                  on information provided by those persons and PIM;
(q)               Coordinate the performance of administrative and professional
                  services rendered to the Trust by others, including its
                  custodian, registrar, transfer agent, dividend disbursing
                  agent and dividend reinvestment plan agent, as well as
                  auditing and such other services as may from time to time be
                  mutually agreed;
(r)               Consult as necessary with the Trust's officers, independent
                  accountants, legal counsel, custodian and transfer and
                  dividend disbursing agent in establishing the accounting
                  policies of the Trust;
(s)               Review implementation of any stock purchase or dividend
                  reinvestment programs authorized by the Board of Trustees;
(t)               Provide such assistance to PIM, the custodian and the Trust's
                  counsel and auditors as generally may reasonably be required
                  to properly carry on the business and operations of the Trust;
(u)               Respond to, or refer to PIM, the Trust's officers or transfer
                  agent, shareholder inquiries relating to the Trust; and
(v)               Provide such certifications as the Trust shall reasonably
                  require in connection with the contract required under Section
                  302 and 901 of the ▇▇▇▇▇▇▇▇-▇▇▇▇▇ Act and the implemented
                  regulations of the SEC.
PIM agrees to deliver and to use its reasonable commercial efforts to cause the
custodian to deliver, on a timely basis, such information to the Administrator
as may be necessary or appropriate for the Administrator's performance of its
duties and responsibilities hereunder, including but not limited to, daily
records of transactions, valuation of investments in United States dollars
(which may be based on information provided by a pricing service) and expenses
borne by the Trust, the Trust's management letter to stockholders and such other
information necessary for the Administrator to prepare the above referenced
reports and filings, and the Administrator shall be entitled to rely on the
accuracy and completeness of such information in performing its duties
hereunder.
All services are to be furnished through the medium of any officer or employee
of the Administrator as the Administrator deems appropriate in order to fulfill
its obligations hereunder.
Each party shall bear all its own expenses incurred in connection with this
Agreement. Printing and dissemination expenses, such as those for reports to
shareholders and proxy statements, shall be expenses of the Trust.
2.       SERVICES TO BE PROVIDED BY PIM. The Trust hereby retains PIM, subject
to the supervision and directions of the Board of Trustees of the Trust, to
provide the services set forth in Annex A.
3.       COMPENSATION OF THE ADMINISTRATOR. The Trust will pay the Administrator
a fee on the first business day of each calendar month for the previous
month equal to the greater of (i) $120,000 per annum ($10,000 per month), or
(ii) at an annual rate equal to 0.07% of the Trust's average weekly Managed
Assets (as hereinafter defined). For the purposes of determining fees payable to
the Administrator, the value of the Trust's assets shall be computed at the
times and in the manner specified in the Trust's Registration Statement on Form
N-2, as amended from time to time (the "Registration Statement"). Compensation
by the Trust to the Administrator shall commence on the date of the first
receipt by the Trust of the proceeds of the sale of its shares to the
underwriters as described in the Registration Statement, and the fee for the
period from the date the Trust shall receive the proceeds of the sale of its
shares to the underwriters as aforesaid to the end of the month during which
such proceeds are so received, shall be pro-rated according to the proportion
that such period bears to the full monthly period. Upon termination of this
Agreement before the end of a month, the fee for such part of that month shall
be pro-rated according to the proportion that such periods bear to the full
monthly period and shall be payable within seven days after the date of
termination of this Agreement. "Managed assets" means the total assets of the
Trust (including any assets attributable to any leverage that may be
outstanding) minus the sum of accrued liabilities (other than liabilities
representing financial leverage). The liquidation preference on any preferred
shares is not a liability.
4.       NO COMPENSATION TO PIM. PIM shall not be entitled to any fee under this
Agreement. PIM shall be entitled to out of pocket expenses incurred in
connection with its services under this Agreement.
5.       LIMITATION OF LIABILITY, INDEMNIFICATION.
(a)      The Administrator or PIM may, with respect to questions of law, apply
         for and obtain the advice and opinion of legal counsel, and with
         respect to the application of generally accepted accounting principles
         or Federal Tax accounting principles, apply for and obtain the advice
         and opinion of accounting experts, at the reasonable expense of the
         Trust.  The Administrator shall obtain prior permission of the Trust or
         PIM before obtaining the advice and opinion of legal or accounting
         experts at the expense of the Trust, and shall not use any counsel or
         accounting experts to which the Trust or PIM shall reasonably object.
         The Administrator and PIM shall be fully protected with respect to any
         action taken or omitted by it in good faith in conformity with this
         paragraph.
(b)      The Administrator shall not be liable to the Trust or PIM, nor shall
         PIM be liable to the Administrator or the Trust, for any action taken
         or omitted to be taken by the Administrator or PIM, as the case may be,
         in connection with the performance of any of their respective duties or
         obligations under this Agreement, and Trust shall indemnify the
         Administrator and PIM and hold each of them harmless from and against
         all damages, liabilities, costs and expenses (including reasonable
         attorneys' fees and amounts reasonably paid in settlement) incurred by
         the Administrator or PIM, as the case may be, in or by reason of any
         pending, threatened or contemplated action, suit, investigation or
         other proceeding (including an action or suit by or in the right of the
         Trust or its security holders) arising out of or otherwise based upon
         any action actually or allegedly taken or omitted to be taken by the
         Administrator or PIM, as the case may be, in connection with the
         performance of any of their respective duties or obligations under this
         Agreement; provided, however, that nothing contained herein shall
         protect or be deemed to protect the Administrator or PIM against or
         entitle or be deemed to entitle the Administrator or PIM to
         indemnification in respect of any liability to the Administrator, PIM,
         the Trust or its security holders to which the Administrator or PIM, as
         the case may be, would otherwise be subject by reason of willful
         misfeasance, bad faith or gross negligence in the performance of its
         duties, or by reason of its reckless disregard of its duties and
         obligations under this Agreement.  Such expenses shall be paid by the
         Trust in advance of the final disposition of such matter upon invoice
         by the Administrator or PIM, as the case may be, and receipt by the
         Trust of an undertaking from the Administrator or PIM, as the case may
         be, to repay such amounts if it shall ultimately be established that
         the Administrator is not entitled to payment of such expenses
         hereunder.
(c)      As used in this Paragraph 5, the term "Administrator" shall
         include any affiliates of the Administrator performing
         services for the Trust contemplated hereby, and trustees,
         officers, agents and employees of the Administrator or such
         affiliates. As used in this Paragraph 5, the term "PIM" shall
         include any affiliates of PIM performing services for the
         Trust contemplated hereby, and Trustees, officers, agents and
         employees of PIM or such affiliate.
6.       ACTIVITIES OF THE ADMINISTRATOR AND PIM. The services of the
         Administrator and PIM hereunder are not exclusive and nothing in this
         Agreement shall limit or restrict the right of the Administrator or PIM
         to engage in any other business or to render services of any kind to
         any other corporation, firm, individual or association. Each of the
         Administrator and PIM shall be deemed to be an independent contractor,
         unless otherwise expressly provided or authorized by this Agreement.
7.       DURATION AND TERMINATION OF THIS AGREEMENT. This Agreement shall become
         effective as of the date on which the Trust's Registration Statement on
         Form N-2 shall be declared effective by the SEC and shall thereafter
         continue in effect unless terminated as herein provided. This Agreement
         may be terminated by either party hereto (without penalty) at any time
         upon not less than 60 days prior written notice to the other party
         hereto.
8.       AMENDMENTS OF THIS AGREEMENT. This Agreement may be amended by the
         parties hereto only if such amendment is specifically approved by the
         Board of Trustees of the Trust and such amendment is set forth in a
         written instrument executed by each of the parties hereto.
9.       GOVERNING LAW. This Agreement shall be governed by and construed in
         accordance with the laws of the Commonwealth of Massachusetts without
         reference to choice of law principles thereof and in accordance with
         the Investment Company Act. In the case of any conflict, the Investment
         Company Act shall control.
10.      COUNTERPARTS.  This Agreement may be executed by the parties hereto in
         counterparts, and if executed in more than one counterpart, the
         separate instruments shall constitute one agreement.
11.      NOTICES.  Any notice or other communication required to be given in
         writing pursuant to this Agreement shall be deemed duly given if
         delivered or mailed by registered mail, postage prepaid, (1) to the
         Administrator at ▇.▇. ▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇, ▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇-▇▇▇▇,
         Attention: ▇▇▇▇▇▇ ▇. ▇▇▇▇▇, (2) to PIM at ▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇,
         ▇▇▇▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇ Attention: General Counsel or (c) to the Trust ▇/▇
         ▇▇▇ ▇▇ ▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇ Attention: General
         Counsel.
12.      ENTIRE AGREEMENT. This Agreement sets forth the agreement and
         understanding of the parties hereto solely with respect to the matters
         covered hereby and the relationship among the Trust, PIM and Princeton
         Administrators, L.P. as Administrator. Nothing in this Agreement shall
         govern, restrict or limit in any respect any other business dealings
         between the parties hereto unless otherwise expressly provided herein.
13.      NO ASSIGNMENT. This Agreement shall not be assigned by either party
         without the prior written consent of the other, except that either
         party may assign the agreement to another party if such assignment is
         to a party controlling, controlled by or under common control with the
         assigning party.
IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
day and year first above written.
                          PIONEER MUNICIPAL HIGH INCOME TRUST
                          By:  /s/ ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                          Title:  Assistant Secretary
                          PIONEER INVESTMENT MANAGEMENT, INC.
                          By:  /s/ ▇▇▇▇▇▇ ▇. ▇▇▇▇
                          Title:  President and Chief Executive Officer
                          PRINCETON ADMINISTRATORS, L.P.
                          By:  /s/ ▇▇▇▇▇▇ ▇. ▇▇▇▇▇
                          Title:  Senior Vice President
ANNEX A - SERVICES TO BE PROVIDED BY PIM
1) PROVISION OF OFFICERS TO THE TRUST
2) MONITORING OF THE SERVICES OF PRINCETON ADMINISTRATORS, L.P. UNDER THE
   ADMINISTRATION AGREEMENT