Abstract: In order to cope with the complexity of most actual systems in discrete event simulation, CSPSE, a user friendly and highly interactive graphical tool for drawing, editing and simulating CSPN (Colored Stochastic Petri Net) models of discrete event systems, is developed. This paper shows CSPSE's advantage over the existing simulation tools, then gives a brief review of CSPN. Also, this paper gives a description of the implementation techniques of CSPSE, such as graphical edition of CSPN models, OOP, animation control model, symbol token matching, and etc.