Henan Province, Xinxiang City, a waste incineration power plant fly ash landfill project, conducts leakage detection in the already filled fly ash area. On-site, the high-density resistivity method is used, with electrodes laid on the temporary geotextile membrane surface to collect resistivity data. The presence of leakage areas is analyzed based on the resistivity changes in different regions. The detection area for this project is 36,000 square meters.