Temperature fluctuation is the major reason to influence the stability and performance of instruments. This paper presents a method for the implement of mini thermal-stable system, which can keep the temperature surrounding MEMS accelerator constant. And then, some relative parameters of MEMS accelerator can be improved. This system is easy to get, with special technology, and can change the thermal-stabe working point to reduce power consumption. The result of experiment shows that, the zero-level drift of MEMS accelerator with thermal-stable system decreases obviously.