It uses ABAQUS finite element platform to mechanical calculations in four different conditions for three motorcycle frame, obtains the stress and strain distribution field .Then it takes the modal analysis .The founda-tion is laid for three motorcycle frame performance evaluation and designers , and has important practical value.%利用ABAQUS有限元软件对正三轮摩托车车架不同工况进行力学计算，得到了应力应变场量分布，同时对车架进行了模态分析，所得结果可为正三轮摩托车车架性能评估和设计提供一定的理论依据，具有重要的实用价值。
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