After the shock absorber is installed according to the standard, bushing reset and four-wheel alignment are particularly important. The bushing on the automobile chassis has its own stress, if it is in the state of the body height of the original factory, the bushing is in an optimal position, then after replacing the shock absorber, the body is lowered, the angle of the arm will be changed, if the bushing is not reset, the bushing will always be in a working state one by one, and the distortion and deformation are produced. Bushing reset is to change the bushing position while lowering the body condition, so that it can get the best working condition.