Abstract: The mechanical environment measurement system, loaded on HY-2 satellite firstly, is to obtain the mechanical environment of the spacecraft during launch flight and in orbit. The mechanical environment parameters of the key equipment and the key parts of the spacecraft can be used to analyze the mechanical response of the whole launching process for the spacecraft and the vibration energy passing in the spacecraft structure. In this paper, the mechanical environment measurement system is introduced, and the measurement results are discussed. These results can serve as the references to improve the simulation model and the ground mechanical experiment.