This paper analyses the early breaking of semiaxle of truck and probes into its causes,putting forward the feasible technological innovation project which will lengthen the service of semiaxle.

• 针对某载重汽车后桥半轴常发生早期断裂的现状,进行了分析和探讨,找出了原因,并提出了切实可行的技改方案。