The efficiency and safety of the underwater concrete cube installation in the breakwater project is critical,and the traditional installation methods and detection methods are seriously inadequate.The 3D real-time sonar imaging system has effectively overcome the disadvantages of the traditional methods,and has the advantages of real-time,efficiency,clarity and personnel safety.And it can work under complicated conditions such as low visibility and poor sea condition.In this paper,based on Israeli port of ashdod Ashdod port breakwater engineering project,the techniques and control measures taken for installing concrete cube for 3D sonar imaging system are introduced and summarized,which serves as a reference for the construction of similar projects.