The hydraulic grab head and impact drill are the main equipment for large underground continuous wall construction,but in overseas engineering,because of the lack of local construction equipment and other constraints,it is difficult to meet the needs.With limited equipment resources,i.e.only two rotary drills,one impact drill and mud purification machine,we explore the new technology of underground continuous wall construction considering the local existing resource and by the technological innovation,to meet the needs of the underground continuous wall construction in the pure seawater environment.