In the whole machine structure test, the aircraft is usually supported by a threepoint suspension of the landing gear. The conventional support device is a “crowbarcolumn” mode, which also has a vertical loading function of the landing gear. When assessing the structure of the landing gear connection zone, the landing gear will have a certain deformation under the direction of the heading and lateral loads. Since the support point of the conventional “crowbarcolumn” crowbar is fixed, the deformation will cause the vertical landing force line deviation and to result in that loading is not accurate. The principle of plane follower was adopted to improve the conventional crowbar fixed support point into a balltype follower platform. By the passive movement of the follower platform, the deformation of the landing gear was compensated and the deviation of the vertical loading force line was reduced. Through theoretical analysis and experimental verification, it shows that the improved “following crowbarcolumn” support device can significantly reduce the vertical loading error and improve the loading accuracy.