Abstract: The OZIPR model was used to study the impact of primary pollutants on the changes of ozone concentration.Three comparable modeling scenarios were designed: changing initial concentration ratio of VOC and NO_x,changing emission ratio of VOC and NO_x,and changing the composition of VOC.The results show that with the increase of the initial concentration ratio and emission ratio of VOC and NO_x,and with the increase of the ozone concentration growth rate,the occurrence time of maximum ozone concentration will be brought forward,and the daily peak value of ozone concentration will increase first,and then decrease to some extent.Combined with the analysis of the isopleths of ozone concentration,it is proposed that the ozone pollution in Shenzhen City is VOC sensitive,and the control of VOC emission is an efficient way of ozone control.According to the study on the change of VOC composition,it is indicated that the emphasis should be put on controlling the pollution sources with much EHTH,XYLE and TMBZ for the control of VOC.