【Abstract】 A new method for optimizing governing parameters of hydro-turbine governing system based on integral performance crite-ria(ITAE) under the environment of MATLAB/SIMULINK is introduced in this paper.The method can identify the governing pa-rameters through modifying M-file,simulate the hydro-turbine governing system to obtain the corresponding ITAE indexes of the transient process through calling the model SIMULINK using the parameters identified,and compare the indexes to find the optimal governing parameters according to the minimum value of ITAE.The system incorporates the convenient debug of M-file,and easy to construct complicated model of SIMULINK with the characteristics of modularization.The model SIMULINK is open and transform-able,so it is suited for other hydraulic power stations.The simulation results indicate that interactive simulation between MATLAB and SIMULINK is flexible and effective.