Now, people are in the indoor space about 90% time and need a perfect clean air-circulation system. In this paper, we present an atomizing air purifier system to improve the air quality. This system uses brushless DC motor driver to control air flow, and combines with the electric circuit to control atomization. The system enables the air humidity in higher quality. Then, it may help human body respiratory disease's reduction. Besides, we use carbon dioxide sensing electric circuit to detect carbon dioxide concentration and to control the air-inlet. The experimental results show the feasibility of the system.