Abstract: In recent years, the number of engineering projects for remediation of contaminated sites in China has been increasing rapidly. During implementation of these projects, the issue of secondary air pollution occurring in organic pollutants contaminated sites is attracting more and more concerns. In order to achieve an effective and safe management of contaminated sites remediation projects, the current situations of organic pollutants contaminated sites remediation projects and the characteristics of secondary pollution risk were analyzed. And then taking the contaminated sites remediation project of Beijing Coke & Chemical Factory as an example, on the basis of a detailed analysis of the major construction projects and the secondary air pollution sources of risk in the typical organic pollutants contaminated sites ex-situ remediation project, an all-around system for secondary air pollution prevention was put forward according to the three key factors of volatile organic compounds(VOCs), exhaust and dust. The study can provide references for air environment protection in similar organic pollutants contaminated sites remediation projects of China.