Simulation is a tool for a representative of event. The system will occur or be changed to minimize failure, prevent noise resources and increase the performance of the system. the definition of “Simulation” varied according in specialist disciplines. Nowadays, the simulation has been used to support in many business decisions for preventing risks, uncertainties and provides more confidence in making decisions on business operations. Modeling situations in the present, often applied to the computer because easier to analyze data or complex systems. If the simulation is used carefully, it is a very useful tool for users to identify steps and making the working plan. It is also a meaningful test that can predict and explain behavior problems and solutions of the system. Users can predict performance of the system under the restrictions of the time, the difference of conditions and variables by using the simulation for decision making to real systems