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本文用有限元方法对液压传动及控制系统以及液压元件中经常遇到的后台阶流道的流场进行了研究，分别计算了Re＝200和Re=400下流动区域中的流函数及涡量值，为进一步分析复杂流道中的流动本质以及减少流动阻力和流道的优化设计提供了理论依据．具有一定的实际意义。
In this paper, the finite element method is used to study the flow field of the backstepping runner which is often encountered in the hydraulic transmission and control system and hydraulic components. The flow function and vorticity in the flow area at Re = 200 and Re = 400 are calculated respectively. It provides a theoretical basis for further analysis of the nature of the flow in the complex flow channel and the optimization of the flow resistance and flow channel. Has some practical significance.