Abstract: During pipeline location and coating detection with SL Coating Leak Detector of buried pipeline, some puzzling issues are often existed such as signal drifting of target pipeline, weak signal picked up, difficult to determine effective detection distance and inaccurate holidays location in complicated pipeline networks. Detection experience from application of the detector is summarized, and practical methods and skills in adopting the detector in determining detection scope, holiday inspection for coating, digging verification for coating and holiday detection for complicated pipeline networks are introduced.