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Variable-rate nozzle achieves range and flow synchronous control according to the spraying shape and spray volume requirements. It has important significance on the precision irrigation. The variable nozzle with fan-shaped hole and static vane regulator was studied. Hydraulic performance, such as irrigation distribution and irrigation uniformity of variable nozzle under different pressure conditions was analyzed. Comparing with the traditional round nozzle spray domain, influence of variable vane regulator on nozzle performance and sensitivity to the working pressure were studied. The results of double factors repeated test showed that the single nozzle control area of variable precision irrigation sprinkler was reduced by 15.4% than the traditional round nozzle. The sprinkler irrigation evenness was increased by 9.5%. The sprinkler irrigation intensity was reduced by 15.7%. The range was reduced by 5.9%. The spraying domain coefficients reached to 64.0%. Combination evenness variance analysis results showed that the regulator and pressure as well as the interaction between them had significant influence. The design of the variable modifiers needs to meet the performance of nozzle under different working pressure conditions.