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To improve the efficiency of the design and analysis, a computer-aided analysis technology for the planetary transmission was conducted. According to the analysis of planetary transmission and the connection of its module, the general mathematical models of the revolution and torque, which based on the model library for the planetary, clutch and brake, were constructed, and the kinetic equations of planetary transmission were automatic listed. A corresponding computer-aided analysis (CAA) software was programmed which realized the rapid modeling, automatic listing and equations solving, and performance analysis for the planetary transmission system.