The origin of diaphragm walls technology has been over 100 years.In China,the technology of diaphragm walls in ports has developed for nearly 50 years,and the construction of wharf using diaphragm walls technology has been over 35 years,evolving from 15,000 DWT to 200,000 DWT,the world’s maximum tonnage wharf of diaphragm walls has been built.The cast-in-place diaphragm walls’ water-side face of sheet pile in the port and waterway engineering wharf has the characteristic of permanent concealment throughout the entire life cycle,to ensure the quality of the project and standardize the inspection technology,the water transport industry has formulated the Technical Specification for Testing of Diaphragm Wall Structure in Port and Waterway Engineering for the first time.It mainly stipulates the application of the sonic reflection method,crosshole sonic logging method and magnetic logging method respectively for the inspection of the quality of the trench,the quality of the concrete of the wall section and the length of the steel cage in the inspection of diaphragm walls.It focuses on 100% crosshole sonic logging method testing for the trenching and the unit wall concrete of the exposed walls of the permanent structure diaphragm walls of the quality to achieve precise control and meticulous management,and help enhance the brand building of “Made in China-diaphragm wall wharf”.