Taking a certain type of excavator as the research object ,the 3D models of its working device were established and assembled by 3D design software UG NX then pour it into the ADAMS ,the 3D models of the working device is transformed into a flexible body by using the automatic flexible function of ADAMS , establish rigid flexible coupling virtual prototype model .Through the dynamic analysis of the working device ,get load curve at the main hinge points of the device .The maximum load stress of hinged point is 230 kN between movable arm and bucket rod ,which appeared at the digging resistance ’ s maximum value .Verify the correctness of the simulation .%以某型挖掘机为研究对象，利用UG NX三维造型设计软件建立其工作装置的三维模型，然后倒入到ADAMS中，再利用ADAMS自动柔性化功能将工作装置三维模型转化成柔性体，建立刚柔耦合虚拟样机模型。通过对工作装置进行动力学分析，获得装置主要铰接点处的载荷曲线，动臂与斗杆铰接处最大载荷受力为230 kN，此值出现在挖掘阻力最大时刻，验证了仿真的正确性。
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