本文阐述了MATLAB中图形化仿真工具Simulink 的特点以及用于电力系统仿真时发挥的巨大作用，说明了 使用Simulink 仿真的基本方法与步骤，在进行同步发电机基本方程和机端三相短路的理论分析之后，利用Simulink 仿真分析 了同步电机空载情况下机端三相短路，与理论相符，说明了Simulink仿真的有效性。

This paper expounds the characteristics of Simulink in MATLAB, and its great role in power system simulation. It illustrates the basic methods and steps of Simulink simulation. In this paper, after the analysis on the basic equations of synchronous generator and the theory of three-phase short circuit, Simulink is used to simulate the three-phase short circuit of the synchronous motor under the condition of no-load. Compared with the theory, the effectiveness of Simulink simulation is explained.