Abstract: As the heavy oil block of Jinzhou oilfield has entered the period of multiple cycled steam huff and puff,water cut is a-bove 90%,in layer interference and interlayer interference became obvious,coupled with increased interlayer water,invaded edge water and interlayer water channeling have been caused,and all of these have a serious effect on normal pro- duction.Through the analysis of reservoir,production history, optimized design of parameters,the proper agent has been chosen to perfect the formula.The technical application proves the water plugging and channeling preventing at high temperature has achieved good results and will provide a solid foundation for field development.