Fine tapping of old oil fields is a key means of stabilizing the crude oil production. The main old oil fields are generally in the middle and late stages of "double high" development，with great difficulty in stabilizing production，especially in high temperature and high salinity formations. The existing plugging agent technology is difficult to solve problems such as high water content and formation heterogeneity. Based on the harsh conditions of high temperature and high salinity formation and the limitations of existing technologies，this paper introduces the research and application of modified polyacrylamide gel，silica polymer gel，slow cross-linking polymer gel and biological based profile control and plugging gel system at home and abroad，and focuses on the slow cross-linking polymer gel system，slow cross-linking technology and influencing factors. Among the above gels，PEI polymer gel has strong reliability and wider application range，however，with tightening of environmental protection policies，bio-based polymer gel plugging agent is the main development trend in the future.