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This paper discussed how to set up an injection model of iniection molding machine and set the injection pressure by a kind of engineering experiment,to realize the setting of injection velocity classification parameters.Set model curve of Mold Filling according to the physics process of Mold Filling and use computers to solve model curve in order to obtain the classification injection pressure and velocity.This method can obtain the injection velocity classification parameters but neednt to set up accurate mathematical model,specially be suitable for setting up the injection parameters automatically when installing die in injection molding machine.