In order to further study the practical problems of the reciprocating seal of aviation landing gear actuator, the series sealing of VL seal and T-ring seal on the linear reciprocating actuator used in aviation was tested. The working tightness of VL seal and T-ring seal in series is verified by functional performance test, and then the high and low temperature environment test is carried out by changing the temperature of -55 ° C low temperature working test and 135 ° C high temperature working test. Finally, the reliability of reciprocating seal is preliminarily evaluated by life test. The results show that the landing gear seal has excellent performance, can withstand high and low temperature, can maintain good sealing property at high and low temperature, and has excellent performance in life test after high and low temperature. The change of inner diameter, wear amount and leakage amount and leakage rate have a certain positive correlation. The left and right VL seals and T-shaped seals at both ends want to be close to each other regardless of the change in inner diameter size or the change in wear amount, which can be considered to play a sealing role together, and the sealing effect is also good.