Abstract: As to design of landing gear, the paper points out that the stroke of a conventional single-action shock absorber is too short to absorb the impact energy induced by taxing of an airplane on rough runways.They will,therefore,transmit very large loads on to joints and supporting structures of the landing gear and lead to abrupt damage or short fatigue life.In order to control the impact loads, long stroke, double-action shock absorbers have been developed to absorb the impact energy due to landing or tak-ng-off on rough airfields, the peak value of impact loads being noticeablly reduced.Futhermore, the paper discusses the structural type of the landing gears suitable for rough fields, in particular the design conception and characteristics of double-action shock absorbers and compares them with conventional landing gears in many respects.