Abstract: Due to PSS/E cannot be used interactively with other analysis software of power systems, user\|defined model is developed by PSS/E in this paper. Firstly, a user\|defined speed governor model is built by PSS/E based on the electric\|hydraulic speed governor with PID controller in BPA software. Then, its performance is validated by its application to single machine infinite system in BPA and PSS/E. The curves of simulation show that the model can run in normal way and its error indicates that the user\|defined model has similar performance to that of original model. At the same time, the work in this paper shows that the user\|defined model by PSS/E can realize the interactive use function of PSS/E with other simulation software.