Aimed at the problems and requirements of the simulation of satellite communication network, this paper firstly analyzes the basic requirement of the simulation system from the characteristics of satellite communication network and presents the feasible method and approach at the present time. Then, the paper again analyzes the current simulation technology and tools from the simulation method, modeling environment, applicability and simulation granularity , which enriches and expends the idea of distributed simulation technology of satellite communication network; finally, proposes a distributed simulation system design for satellite communication network based on the idea of distributed simulation. The simulation system is composed of two-level and three-category system framework, by which the multi-level and multi-granularity simulation can be implemented; and its minimal simulation granularity reaches bit grade, which provides a foundation for both design and optimization of satellite communication network, and is of great value in theory and application.