In this paper, we accomplished a simulator, which can be used to model the discrete event systems. This accomplished simulator is implemented based on the Petri net theory, and the transaction of Petri net is done by fuzzy inference. To verify this implemented simulation tool is a feasible, and use it to simulate a washing machine. The simulator is developed by Virus Basic 7.0, and executed in Windows platforms. The contribution of this paper has friendly user interface and graphical icon to create model. Now, this simulator is implemented with the traditional Chinese version and it graphic user interface (GUI), too.