Numerous natural and human factors can cause hidden defects in embankments, resulting in dangerous situation during flood period, hence it’s necessary to conduct hazard detection. High-density electrical method as a non-destructive testing technique can effectively investigate the leakage section of the embankment. It’s utilized in this paper the high-density electrical method to search for the possible leakage passage in a certain embankment in Jiangxi and the practice shows that this method can effectively and accurately detect the passage and well worth promotion.