The layout of fishway entrance is the key of hydraulic fishway design. In order to optimize the entrance design, three representative layouts,type - A(the axis of the entrance is vertical to river bank),type - B(the axis of entrance is 30°to river bank)and type - C(scattering the flow at exit by separation pier based on type - B),are selected to conduct the numerical simulation and comparative analysis of the above layouts by CFD models. The results show that type - C entrance with 3 scattered radial canals can generate better flow condition,which is suitable for multiple fishes to swim toward upstream.%进鱼口布置是水工建筑物鱼道设计的关键环节。为优化进鱼口设计，选取进鱼口轴线与河岸垂直（ a型）、与河岸成30°夹角（b 型）以及在 b 型基础上采用隔流墩将出口水流分散（c 型）等3种具有代表性的进鱼口型式。通过建立流体动力学数学模型，对所选3种进鱼口型式进行了数值仿真和对比分析。结果表明：进鱼口轴线与河岸成30°夹角并采用3支渠道辐射状分散布置型式（c 型），可产生较优的水流条件，适宜供多种鱼类上溯。
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