Super deep diaphragm wall is being used widely in subways,tunnels and such underground projects.It requires highly in perpendicularity,waterproof capability,stability,etc.So this brings about lots of difficulties in construction.Construction problems are introduced and discussed,including technology difficulties,methods,and the use of new material as well as new techniques.The control of trench perpendicularity is illustrated in detail,and the main measure is to choose proper construction machine and technology.The measures of improving the stability of slurry trench and the performance of joint waterproof are introduced.Besides,GFRP bar,TRD method,TRUST method and CRM method are introduced,and their outstanding advantages and applicability are given.In addition,suggestions are given about the deficiency in checking the quality of walls.