Abstract：In the Tianjin Economic and Technological Development Zone ton desalination pretreatment water works，the us原
ages of impervious membrane；filling bag；soft geomembrane mattress and other geosynthetics are introduced in this paper.
The optimization of the structure type of grit chamber retaining cofferdam is implemented and the engineering cost is reduced
by its effects of material impervious, protection，isolation and etc. The useful references can be provided for geosynthetics ex原
tended application.