计算机模拟模型分析法是机械设计开发的革命，运用有限元分析法可有效地规避设计风险和失误。对液力传动箱上箱体进行三维建模,提出了力学分析模型，将两个方案进行了有限元分析对比，指导设计方案的改进，提出最终解决方案，解决了设计难题。

Computer finite element method is a revolution of mechanical design, it can avoid risk and faults efficiently with the result of finite element analysis(FEA). This article is about upper case of hydraulic transmission box. First making three-dimension model and offering stress analysis model, then by finite element analysis and comparing two schemes,this design problem is solved by mending scheme.