To investigate the screening approaches and remediation effects of combined remediation technology in organic contaminated sites, a relocation legacy site soil remediation project in Shanxi was used as a case study. In this paper, the commonly used physical, chemical and biological remediation technologies were screened by analytic hierarchy process (AHP). The new combined remediation model of “room temperature desorption + ectopic thermal desorption + landfill cover soil utilization + cement kiln co-processing” was finally determined. The repair effect of the combined remediation model and its impact on the environment were studied. The results show that AHP can be used for screening the best remediation solution for organic contaminated sites, and the combined remediation model has low cost, good effect and no impact on the surrounding. The combined remediation model is effective in treating contaminated soils at this type of site. The successful implementation of this remediation model provides a guideline for similar remediation projects and controls the loss of soil resources to a certain extent.