Objective To explore the causes of postoperative revision for cubital tunnel syndrome(CTS),summarize the details of revision surgery for CTS and evaluate the efficacy,in order to reduce the revision probability of the disease.Methods The data of 14 patients undergoing revision surgery for CTS in our hospital from March 2019 to August 2022 were collected and analyzed.By comparing the first-stage surgical incision,examining the tension and shape of ulnar nerve,the compression site and the improvement of postoperative symptoms,the reasons for revision were summarized and the curative effect was evaluated.Result The reasons for revision included the poor outcome of the initial operation and no improvement of symptoms or symptom worsen within 3 months after surgery.The main cause for revision was irregular incision design(14/14),the secondary cause was incomplete release of nerve entrapment points(12/14),and the rare cause was insufficient hemostasis in the operative area(1/14)and insufficient protection of sensory nerve(1/14).According to Gu's functional evaluation criteria for CTS,the excellent rate of revision surgery was 9/14.Conclusion The main reason for revision after primary surgery for CTS is the inadequate management of surgical details in the first operation,and the revision rate of CTS can be reduced by standardized operation.Revision surgery is still effective after the failure of the initial operation.