Many simulation packages have been developed to simulate discrete event systems. We have develop a package using an algorithm called three phase method introduced by Prof. Tocher. This algorithm has a time controlling phase, a start activity phase and an end activity phase. After recognition of system entities activities and queues for which entities are involved in are denoted and there specifications are asked by a menu driven system. This package using a program which is designed in programming language MATLAB collects the information about the system to be simulated , and generates a simulation program in MATLABÂ programming language.