In order to solve the failure problem of Wsealing ring caused by local spalling in the test process of a aeroengine,the fracture analysis on the Wsealing ring was carried out,and the assembly stress and working stress of Wsealing ring were analyzed.The results show that the main reason for the spalling of the sealing ring is that the initial compression of the sealing ring is too big and the pressure difference in the working environment is too high.The effect of structure parameters of Wsealing ring was researched,and the improvement measures were put forward such as controlling the precompression appropriately and increasing wall thickness of sealing ring.The effectiveness of the improvement measures for the Wseal ring was verified by the engine test.