This habit originated from the former Soviet Union, because in the past, China studied the Soviet Union in an all-round way and regarded it as his big brother, so even the model of military parade was copied from the former Soviet Union. In the former Soviet Union, the "moving bodies" of vehicles (including the wheels of artillery, transport vehicles, tractors, and load-bearing wheels with tracked tracks, etc.). ) During the military parade, they were all painted white. In order to facilitate practice, the vehicles to be read walked neatly, because the wheels of military vehicles were painted white for drivers. During the military parade in the former Soviet Union, not only the wheels were painted white, but sometimes the front panels and sides of tanks were painted white. The PLA's current practice is to learn from the achievements of the Soviet military parade. Since the 1984 National Day military parade, our army painted the load-bearing wheels of the tanks being read white, and the wheels of the cars were too narrow to look good, so the tires were painted white. Has continued to this day.