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In order to shorten development cycle of hydraulic product and improve development efficiency of serialized products, a rapid parallel optimization method based on multi-core CPU for complex hydraulic product was proposed. The rapid parallel optimization method focuses to the parameter optimization and performance constraints of complex hydraulic product utilizing particle swarm optimization algorithm, treating CVODE simulated program as a particle. The method adopted two-stage strategies for speed, which included CVODE strategy and multi-core CPU strategy. Selecting triangle groove design of variable-displacement asymmetric axial piston pump as the research object, the realization process of parallel optimization based on multi-core CPU was designed. Firstly, the accuracy of CVODE simulated program was verified through prototype experiments. The experiments results showed that the experiment results of physical prototype agreed well with that by CVODE simulated program. Secondly, the main parameter of triangle groove was optimized to reduce flow pulsation using PSO. The flow pulsation before and after the optimization was analyzed. Analysis result showed that the outcomes of optimization lowered flow pulsation by 36% without pressure increase of plunger cavity. The proposed method solved the optimization problem that the simulation of hydraulic system was dependent on professional simulation software, and the simulated program can run independently in windows. Compared with multi-threading,this multi-process parallel method had the advantages of easy programing. On the eight core CPU processor, the efficiency of the multi-core parallel method was 10 times greater than that of SimulationX and it was about five times greater than that of dual-core processor.