According to the measured results of the turbine governing system parameter for a certain unit

steam turbine and its actuator models were established. When modeling the DEH control system

it was found that there were big differences between the power control loop of Digital Electro-Hydraulic（ DEH） control system and the built-in models of PSASP. DEH control system model of the unit was faithfully established by user-defined modeling function in PSASP. The turbine governing system model of the units was completely established. Finally simulation and validation for simulation results of the steam turbine governing system model is realized.