In the distributed caa and simulation system , an example of slider - crank mechanism is given . the example use planar multibody dynamic method to analysis the movement rule of slider - crank system under gravity and moment and demonstrate the multibody systems dynamic analysis method 基于实现的分布式计算机辅助分析与仿真系统,本文以曲柄滑块为例,利用平面多体动力学通用模型分析了在受到重力和转动力矩的情况下曲柄滑块的运动规律。