During the landing gear fatigue test, the compression of the buffer changes constantly, and the position of the corresponding loading point needs to be adjusted accordingly. To simulate the loading state of the landing gear completely and ensure the fast running of the test, the self-adjusting technology of the buffer compression and the follow loading technology of the landing gear were studied. A large load hydraulic servo loading device with heading, lateral, vertical and ejection follow loading capability was developed, also the fatigue interactive control loading control technology was developed based on mechanical testing & simulation(MTS) coordinated loading system, the bearing capacity of the main structure of the landing gear in the process of catapult launch and landing taxiing were verified. The results show that the position of each loading point can be adjusted with the change of the compression of the landing gear buffer, which has high control and loading accuracy, and significantly improves the test efficiency. Meanwhile, the technology and loading device are universal and can be used for static/fatigue tests of different types of landing gear, which has certain engineering value.