Organic-inorganic crosslinked plugging system was prepared with resin prepolymer CL,silicide and stabilizer SY.The microstructure of the gelling system observed by ESEM showed that there existed the network structure.The optimal formula of the system at 130℃ CL was obtained through lab test,and the appropriate mass fraction of resin prepolymer was 4%7%,the silicide was 1%5% and the stabilizer SY was 0.1%0.3%.Evaluation test of thermal stability showed that the plugging agent was resistant to the high temperature of 140℃,and it’s gelation time at 130℃ was adjustable from 2 to 24 hours,and which could be prolonged to 50 hours at least when the temperature was reduced to 110℃.The change of apparent viscosity during the gelling process showed that the injectivity was good.The core modeling experiment indicated the plugging rate of the agent could reach over 98.5%;moreover,it had nice performance of flushing resistance.