This paper analyzes the operation flow of equipment maintenance support command system (EMSCS) as viewed from the object-oriented, establishes the object-oriented workflow model of EMSCS. On the basis of this, this paper makes the OOCPN analytical model of EMSCS, provides the quantized analyzing method for evaluating the system running efficiency. The method reduces the complexity and improves the efficiency of EMSCS modeling. At the same time, it can also satisfy the open, hierarchy and dynamic regroup of EMSCS, has high applying value.