枞树形多齿结构榫头的榫槽裂纹是国内外多种型号喷气发动机的危险故障之一.经综合分折,本文指出裂纹故障的主要原因是多齿结构和第一榫齿冷态单齿接触承载。榫头结构因素和热应力是引起第一榫槽裂纹故障的重要原因,而振动对榫槽裂纹扩展也有一定影响。建议对设计、制造和使用各个环节采取一些相应的措施. The mortise and tenon crack of the fir-tree multi-tooth structure tenon is one of the dangerous faults of many kinds of jet engines at home and abroad.This paper points out that the main reason of crack failure is the multi-tooth structure and the first single-tooth cold tooth contact Carry. Tenon structural factors and thermal stress are the main causes of the failure of the first mortise and tenon crack, and the vibration also has some influence on the mortar crack growth. Proposed to design, manufacture and use of all aspects to take some appropriate measures.