Abstract: This paper presents a method of on-line monitoring of dust concentration using corona charge and piezoelectric effect principle based on TRIZ’s innovative ideas. First of all, the system automatically collected the quantitative volume of air. Secondly, we set the corona polarization in the system to form a negatively charged particle. Finally, the weight of the particles is calculated based on the voltage change value produced by the deformation of the piezoelectric ceramic, and then, the dust concentration is calculated by iteration. The system also designed automatic purging function, which greatly improved the stability of the monitoring system.