Abstract: The hydraulic turbine regulating system plays an important role in ensuring the safe and stable operation of the power grid. This paper sets up a simulation platform for hydraulic turbine regulating system based on the combination of virtual models and real units by connecting the real governor with the servo system based on the nonlinear model of the unit and the unit simulator. The nonlinear modeling and realization methods of the servo system and the hydro-generator set in the hydraulic turbine regulating system are presented. Through the real machine comparison test,the accuracy and superiority of the simulation platform is verified. With the help of the simulation platform,various closed-loop dynamic tests can be carried out,the control law and adjustment parameters of the governor can be checked and optimized,the transition process such as load adjustment of the unit can be reproduced,which is convenient for the analysis and evaluation of the transition process,implement fault inversion and staff training.