Abstract: The accumulation of silt in pipelines is an important factor that causes frequent problems in urban areas. This article addresses the deficiencies of manual detection or single instrument detection technique that is widely used at the present stage, explores the combined use of pipeline sonar detection system (X4), ground penetrating radar (Canada EKKO) and pipe endoscopy (CCTV), and carries out the actual pipeline test. The experimental results of the pipeline deposition test show that the combined detection method has a significant effect as compared with the traditional single detection method while with no inspection wells and with difficulty in performing artificial detection of the accumulation of drainage in pipelines. It is of a nondestructive detection and has rapid detection speed and the advantages of reliable results. It will provide a new detection method for the selection of technology for water pipeline silt detection in the future.