The torsion spring mainly plays a balancing role in industrial production. For example, in a car's suspension system, it interacts with the car's shock absorber, and the torsion angle of the spring causes the material to deform and return to its original state. Thereby preventing the car from excessive vibration, it protects the car's safety system very well. However, the spring will produce crack damage during the entire protection process, also known as fatigue fracture, so technicians or consumers should pay attention to fatigue fracture. As a technician, it is necessary to avoid sharp angles, gaps, and cross-sectional mutations in the structural design of parts as much as possible, thereby reducing stress concentration and fatigue cracks. Therefore, manufacturers should improve the processing quality of the surface of the parts to reduce the source of fatigue. In addition, surface strengthening treatment can also be adopted.