In order to solve the problem of efficient and accurate measurement of aerosol mass concentration, an aerosol photometer is developed based on the principle of measuring aerosol mass concentration by light scattering method. The constant flow control module is designed. Based on the principle that the forward scattered light of aerosol by laser irradiation is proportional to the mass concentration, the optical signal is converted to electrical signal by photomultiplier tube, and the linear coefficient is calculated according to the high-precision comparison instrument results under the same measurement conditions. The experimental results show that the indication error of the aerosol photometer system developed in this paper can be within ± 5%, and the repeatability deviation is within 3%, which meets the requirements of aerosol photometer calibration specification, realizes the measurement of aerosol mass concentration, and has good application value.