With the continuous development of oil and gas exploration and development in the direction of deep wells， ultra-deep wells and other high-temperature and high-pressure wells， the oil and gas industry has put forward higher requirements for the overall gas sealing capability of the liner hanger. The conventional hydraulic liner hanger has a hydraulic cylinder on the body. Pressure transmission holes and rubber seals lead to weak sealing points， which make it difficult to meet the long-term sealing integrity of the wellbore and the high-pressure completion requirements such as fracturing in the later stage. For this reason， foreign companies have successively developed the integral gas-sealed liner hanger technology. Innovations have been made in the design of the seat-hanging drive mechanism. The body of the liner hanger adopts an integrated structure， and there are no sealing weak links such as pressure transmission holes or seals， which greatly improves the overall sealing capability of the system. On the basis of comparing the structural composition of conventional hydraulic liner hangers， this paper introduces the structural principles and technical characteristics of several representative integral air-tight liner hangers abroad， summarizes and analyzes the future development trend of liner hangers， and puts forward Some suggestions for the direction of liner hanger technology research and development in the future are given.