Abstract: The membrane interface probe (MIP) is a technical device for in-situ investigation of volatile organic-contaminated sites in soil and groundwater. In recent years, it has been widely volatic organic compounds-contaminated sites. The structure of MIP, testing principle and matching gas chromatograph detector are introduced. The application cases of MIP in the investigation of contaminated sites in China and abroad are reviewed. The research results of foreign scholars on MIP testing accuracy are summarized. The analysis shows that the MIP in-situ test can comprehensively and realistically reveal the distribution of volatile organic compounds in contaminated sites, reduce the investigation cost of contaminated sites, and improve the investigation efficiency of contaminated sites. Through the combination with other in-situ test probes, the geotechnical characteristics of the contaminated sites can be evaluated at the same time, which provides basic geotechnical information for the implement of subsequent contaminated site treatment.