Abstract: A virtual modal is developed by focusing on the type of JBP－63 electro-hydraulic control radial piston pump as to fit its working conditions. The pump performance is predicted by using computer simulation with static and dynamic characteristics. The modal results are consistent with the experiment results. The numerical output showed the system parameters changing process and the influence on the system characteristics as adjusted the parameters. The results displayed that a virtual modal according to the under designing system could predict its performance and analysis by means of the modal，the application provided very useful value and significance message for the design of system and parameters optimization.

Key words: Electro-hydraulic proportional, Performance prediction, Radial piston pump, Simulation