In the yaw control strategy of the wind turbine，the state switching between each yaw action needs to be realized by the joint control of hydraulic clamp,electromagnetic brake and yaw drive motor,and the required four time points need to be obtained through prototype testing.In view of this,the in-plant test of a certain model hydraulic system was taken as an example to obtain the pressure relief-pressure construction test curves.Multiple sets comparative tests were added to deeply analyze the factors affecting system performance.The simulation analyses were performed through AMESim to provide more ways for system rapid optimization.The results show that the pressure relief- pressure construction curves measured by the three hydraulic stations have high consistency,and the four time points can be accurately obtained;the single accumulator and dual accumulator have little effect on the pressure relief-pressure construction velocity of the system;the different loop pressure values have greater influence on the system pressure construction time and less influence on the pressure relief time;the total outlet pressure response of multiple series brakes lag behind the total inlet pressure response.Simulation means can be used to set more system variables to further optimize the system strategy and reduce the failure rate of unit operation.