Abstract: Long times ago, setting protect pillar is one of the mainly methods for chamber protection. But if the location is irrational, the chamber's deformation will be highly by pillar's gravity and mining stress on the edge. Based on the geotechnical conditions of Level-3 pump chamber in YuanZhuang coal mine, the broken mechanism of pump chamber is particularly analyzed, and proposed the rational support program. The application results shows that pump chamber deformation can be effectively controlled by new supporting technique. It also can be as a reference for chamber or roadway in propinquity conditions.