Recently small satellites such as micro satellite are gathering more and more attention and various missions are under consideration in the world. Since these missions have been becoming complicated, consequently high-performance satellite bus systems are required. To assure their reliability, the ground tests for the satellites are indispensable. Not all of the conventional methods to validate the satellite system for large satellites can applied for the small satellites, therefore we TSUBAME Development team suggest and conduct the tests to assure, verify and validate the micro satellite, whose methods are suitable for micro satellites. In this paper these approaches are described.