The aerodynamic performance of an over/ under type inlet for turbine-based combined cycle engine inlet in model transition was analyzed by unsteady and steady numerical simulation method. The lfow characteristics with different high duct cowl rotation angle and model transition time were compared and discussed. Results indicated that: The rotation of high duct cowl will improve the performance effects of the high duct. Different time of model transition had no obvious impact on aerodynamic performance.%对一种外并联涡轮基组合循环发动机进气道进行了基于定常和非定常的模态转换过程气动特性分析，并研究了模态转换时间对进气道气动性能的影响。最终获取了进气道模态转换过程的流动特性，并分析了模态转换时间对外并联TBCC进气道的气动性能影响。结果表明：低速唇口旋转角度相同时，不同模态转换时间下的气动性能参数基本一致。
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