Abstract: The conventional gel plugging agents have some shortcomings such as low intensity, poor heat/ salt resistance and high cost. In view of high temperature and salinity in the Tahe Oilfield, the combination of organic gel and inorganic network is introduced, and a new gel plugging system with higher resistance for heat/ salt is set up. The new system remains stable for 90 days in formation water at the temperature of 130 ℃ and the salinity of 20×10⁴ mg/ L, showing good capacities of plugging. It has been applied in well TK937H, raising oil product obviously.