Abstract: Infusing modified clay mixed slurry into geological damage under high confining pressure has become one of the most widely used grouting methods.But due to the lack of initial setting time testing method under the high confining pressure and drainage conditions, to study on the mixed slurry initial setting time is difficult.The initial setting time of modified clay mixed slurry under high confining pressure was studied through the self-developed slurry consolidation test platform, so as to guide the field production.