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Vehicle transmission system parameter matching is very important for improving the performance of vehicle. Applying Pareto optimal theory to the multi-objective optimization design of the vehicle transmission system, a multi-objective optimization model of vehicle is built regarding dynamic performance, fuel economy and emission performance of vehicle as sub-objective functions, and the transmission ratio of the system as design variable. With case study of certain car, it gains the Pareto optimal solution set of the transmission system by calculating and realizes the optimum matching between engine and transmission system based on optimization software of iSIGHT and NSGA-II algorithm. The results prove the feasibility of the research methods used in this article in optimization for complex system with multi-parameters and multi-objectives.