Abstract: Analyze the regulator pressure control principle of the Hongyanhe unit 1. Analyze and study the disturbance test results of the PZR pressure closed-loop control loop in HFT, which include +0.1,-0.1, +0.5,-0.5 MPa variation. According to the phenomenon not conforming to the acceptance criteria, put forward the optimization scheme after careful analysis. Optimize the pressure control loop by adjusting the PID differential parameters and the retrace tolerance of ON/OFF heater to get satisfactory results. Compare the Hongyanhe 1# test result with the results of Ningde and Ling’ao to gain rich experience for HPT and the subsequent unit. The disturbance test on the regulator pressure closed-loop control loop is of great significance to HPT and the transient test from fuel loading to commercial operation.