The landing gear seal technology is one of the most important parts in the design of the landing gear.However,because there is no specific literature on the landing gear sealing technology at present,the designers usually design the seal components based on the design experience,and the safety and reliability of the landing gear cannot be guaranteed after load,size and material changed.The working principle of the sealing device of the landing gear was introduced.Then several kinds of seal structures which have been successfully applied in the landing gear were discussed,including Vtype seal,Oseal,Yamagataseal,glydring,stepseal and VLseal.Their performance characteristics,specific composition and working conditions were analyzed,and the comprehensive performances of these sealing structures were compared.Taking X aircraft and MD82 as examples,the concrete application modes of seal components were introduced,which provided reference for the design and selection of landing gear seal.