Abstract: Basing on rheological dynamics and the real condition of landing gear, the forces that pressed on the landing gear had been simplified and MR (Magneto-rheological or Magnetically Responsive) damper model was applied on landing gear. Annular gap structure was applied on the damper, so the damp force could be easily controlled without changing the area of the gap. As a result, MR damper had many advantages, such as simple structure, small size and easy control. The landing gear system model with fuzzy controller was built and analyzed. Fuzzy controlling method had been chosen and used on the system, and the force influenced by magnetic field strength could be controlled by controlling current. Simulation results show that the energy during landing could be absorbed and consumed quickly by fuzzy control, at the same time, the predominance of applying of the MR damper on landing gear has been showed.