Abstract:With reference to the field case of Zhengzhou ,Airline Hotel foundation construction,a description ismade on the design principle ,method and main caculation criteria of the powder jetting method used in anti -seepage diaphragm with deep foundation pit excavation ,as well as the testing method and data analysis for determination of the major parameters of this method ,Special technical measures employed in the construction and results are introduced .Several problems of the method ,which need further discussions.