In this paper, a high precision and convenient extension simulation platform for satellite attitude and orbit system is
developed, to demonstrate the satellite attitude and orbit system for given space mission, and test the new
underdeveloped algorithms for attitude/orbit dynamics, attitude determination, orbit navigation, and attitude/orbit
control. The simulation platform is based on Matlab/Simulink software, using the technique of Simulink modeling,
importing C/Fortran code in Matlab/Simulink, and embedded Matlab function, with beautiful reusability, inheritability
and expansibility. The paper orderly presents the background behind the development of the platform, the platform
design architecture and capability, the validity of the platform, the inheritability and expansibility of the platform, the
platform implementation example for Chinese weather satellite (FY-3), and the future development for the platform.