In order to meet the needs of satellite research and simulation in the system simulation platform, conducted research on the method of constructing a general satellite platform model based on the SOSIM system simulation platform independently developed. It proposed algorithms for satellite model orbit extrapolation calculation, field of view detection, and inter-satellite link simulation. It also conducted a study on the Walker constellation design with three configurations, thus forming the capability of satellite model simulation and large constellation generation in the system simulation platform, providing powerful support for satellite orbit simulation, constellation generation and analysis, detection and interference, and communication link analysis, as well as large-scale satellite simulation and simulation.