Abstract: Analysis on the features of the fracture and the body of high strength steel bolts were carried out and the failure factors were analyzed considering the loading conditions and the working conditions of the bolts in their application environment.The results shown that the failure cracks of the bolts were initially induced by crevice corrosion,and the stress couuosion and fatigue corrosion brought about propagation of the cracks, and finally the failures occured,that is to say,the failures of the bolts were result from several fators.