VAN KAMPEN FOCUS PORTFOLIOS MUNICIPAL SERIES 320, 485BPOS, EX-99.1.1, 2000-10-25

VAN KAMPEN FOCUS PORTFOLIOS MUNICIPAL SERIES 320
485BPOS, EX-99.1.1, 2000-10-25

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               Consent of Independent Certified Public Accountants

     We have issued our report dated August 18, 2000 accompanying the financial
statements of Van Kampen Focus Portfolios, Municipal Series 320 as of June 30,
2000, and for the period then ended, contained in this Post-Effective Amendment
No. 1 to Form S-6.

     We consent to the use of the aforementioned report in the Post-Effective
Amendment and to the use of our name as it appears under the caption "Auditors".

                                                              Grant Thornton LLP



Chicago, Illinois
October 25, 2000