Abstract: Taking the investigation of PE water supply pipe in a construction site in Dezhou, Shandong Province as an example, this paper introduces the geological conditions and geophysical characteristics of the engineering site, data acquisition, data processing, etc., uses the ground device of ultra-high density resistivity method to delineate the high resistance anomaly near the highway according to the inversion resistivity results, and analyzes and verifies the reasons for the anomaly delineated by the inversion results, which has some reference value. It effectively guides the development of pile driving. At the same time, it summarizes the problems that should be paid attention to in the construction, and provides experience reference for similar work.