Abstract: The Chinese sturgeon,Acipenser sinensis,is an anadromous protected species that presently only spawns in the Yangtze River. It is also the important fishery resources. Its migration pattern is blocked due to the Gezhouba projects,so the length of natural spawning site has reduced from 800 km to less than 5 km,thus,it becomes the extra-protected animal. In this article,the ecological-hydraulics models is established to simulate and analyze the 3-D flow character by using the N-S and the k-ε formulas,the method of volume of fluid is also used to simulate the two phase flow,and the finite volume method is used to disperse the calculated area,which aims to provide technical parameters for the optimizing regulation of Three Gorges reservoir.