By using high density resistivity imaging (ERT) method, the areas affected by halogenated hydrocarbon organic pollutants have been detected, such as dichloroethane and dichloropropane in the groundwater and soil of a chemical industrial park in a certain city. The abnormal electrical characteristics of the polluted site have been obtained. Through comparing chemical analysis test data of drilling holes, it is determined that the pollution halo formed by high concentration organic pollutants (DNAPL) exhibited high electrical resistivity characteristics. Combining with geological data, geological structures and distribution range of pollution plumes have been accurately identified, and the migration route and formation mechanism of pollutants have been reasonably explained. It will provide some references for groundwater and soil remediation work in the park. Practice has shown that ERT detection technology has good application effects in the investigation of organic pollution in groundwater and soil.