Abstract: Aiming at the failure problem of large drum in coke dry quenching(CDQ) hoist, the strength of the drum structure was analyzed with ANSYS software, and the stress distribution rule of the drum under normal load was obtained, and causes of its failure were analyzed. The fatigue life of the drum was analyzed with FE-SAFE software, and its prone to fatigue damage position was determined, and the fatigue life was also predicted. The local structure of the drum was improved according to the position and characteristics of the failure. The optimal scheme, which mounts a ring on the drum and increases the drum thickness was finally given after comparing the stress distribution rules between original and improved structure of the drum. The research result can provide guidance for improving the design and maintenance of large drum in hoist.