A method of building equipment simulation training system (ESTS) based on virtual reality is put forward. With the method, single equipment model is built by GL studio, and integrated equipment model is built by multigen creator. It adopts Petri Nets to model the operation rules of equipment. All of the models are driven all together by vega prime in the simulation scene at last. Design and key technologies of ESTS are presented. Software prototype of certain integrated communication system is developed based on plug-in framework. Its simulation examples show greatest traits on building similar large-scale simulation system.