Aiming at test requirement of proportional valve performance, a test system based on CompactRIO was developed. The system with high efficiency， test ability and flexibility was highly automated. The pressure control system was analyzed. Since it was a servo system, the strategy of pressure closed-loop PID control with feed-forward compensation was put forward. Test results show that the control strategy increases system pressure accuracy on basis of without increasing the cost of system hardware. Based on the test platform, a test platform of valve performance improvement was developed, and the effect of vibration signals on the valve with hysteresis was analyzed. The theoretical analysis and experiment results both show that when flutter frequency is excessively low, oscillatory valve may be resulted, and the hysteresis can be reduced only with appropriate amplitude and frequency. 