The recent theoretical research,numerical simulation and experimental research of valve sealing performance were summarized,which focuses on the sealing mechanism.The main research contents of sealing performance were summarized as follows:sealing specific pressure,microchannel leakage rate and thermal solid coupling analysis from the contact mechanism of valve seal;cavitation,erosion,wear and corrosion of valve seal from the perspective of valve seal damage under longterm operation.The development directions of valve sealing performance research are as follow:perfecting the valve sealing contact theory and leakage prediction theory;strengthening the thermal solid coupling calculation of valve seal under high parameters condition;studying the sealing damage of multiple factors based on various methods;promoting the research and development of highperformance sealing materials.