Equipment Maintenance Support System (EMSS) is a class of complex dynamic system. How to effectively analyze and construct simulation model for EMSS is a problem. Firstly，a two-layers framework named “physical layer—operation layer” framework is presented to analyze the EMSS in detail. Secondly, the concept of Object is extended to Stochastic Service Resource Management Object (SSRMO) to model the physical layer of EMSS. Thirdly, a modeling approach based on UML dynamic modeling technique for the operation procedure of EMSS is presented and the operation procedure model is further decomposed into the operation rules of SSRMO. Finally, a detailed simulation experiment nearly including all the important aspects of EMSS is designed and conducted. The results have revealed the integrality of the two-layers analyzing method and the feasibility of SSRMO in modeling the physical resource and the artificial rules.