In order to simplify analysis of the dynamic characteristics and seismic response of the integral abutment curved box bridge (IACBB), automatic iteration of the multimode modal response spectrum (MMRS) is realized by APDL language of the structure analysis software ANSYS according to the IACBB's structural characteristics. The realization flow of iterative MMRS in Ansys were presented, and the availability and precision of the iterative MMRS were examined by the time-history analysis. The result shows that 1) the iterative MMRS is a efficient simplify method, and can be used as an estimating method of seismic analysis for the bridge. And the method provides a reference for future similar structures. 2) several conclusions of earthquake response are given. The research results are helpful for the knowledge of mechanics property of the type of the bridges.
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