As a main remediation technology for organic contaminated sites, in-situ themmal desorption has advantages such as no need to excavate and transport soil, high equipment mobility and short remediation cycle. Previous research focused on the repair effect and influencing factors of in-situ thermal desorption. However, the research on repair mechanism and removal path was more conducive to process optimization. The occurrence characteristics and influencing factors of organic pollutantsin soil were introduced. The desorption mechanism of organic pollutants during soil heating was analyzed. The treatment process of organic pollutants,which was transferred to tail gas,was discussed, and some suggestions for further application research were put forward.