In this paper, the developing of DOAS (Differential Optical Absorption Spectroscopy) in China is presented. The measurement campaigns were performed from November,2001 to February, 2002 in
Shanghai and from June, 2001 to April, 2002 in AIOFM (Ahhui Institute of Optical and Fine Mechanics) Hefei respectively to determine the concentration of SO2, NO2 and O3 in ambient air. For measuring the distribution of pollutants in troposphere, a new kink of DOAS system with high spatial and temporal resolution was developed under the cooperation between German and Chinese researcher. This work was described in the latest part of this paper.