Due to the abuse of the invariable pressure causing drip irrigation clogging and the low uniformity on the condition of the drip emitter was clogged，based on the technologies of automatic control and frequency conversion, a system of drip irrigation using dynamic operating pressure was proposed. Utilizing orthogonal experiment, the emitters performed hydraulic experiment by taking the base pressure, cycle and amplitude as factors. It is found that ,the base pressure and amplitude have a significant effect on emitter's average discharge and anti-clogging ability, and the rational combination of base pressure and amplitude can increase the average discharge and improve the anti-clogging ability on the condition of the drip emitters were partly clogged. The cycle has a significant effect on the emitter's uniformity. The regression relationship of the dynamic factors-average discharge was established. Then，the design of dynamic pressure drip irrigation system was disclosed.