AIM:To evaluate the effect of suturing contusion cyclodialysis cleft under ultrasound biomicroscopic (UBM)．METHODS:To analyze the clinical data of 57 cases with contusion cyclodialysis cleft sutured under UBM and evaluate its effects.RESULTS:In our study of 57 eyes with contusion cyclodialysis cleft sutured under UBM, the intraocular tension recovered to normal shortly after the operation in 53 eyes,the intraocular tension recovered to normal after second operation in 4 eyes. In our cases, we found the site and size of cyclodialysis in 42 eyes (74%) by UBM check before the operation, which were successfully sutured. In the 15 cases who were not found the site and size of cyclodialysis,the operation proved success by first suture in 11 cases, by second suture in 4 cases. Visual acuity improved in 48 cases.CONCLUSION:Suturing of the attachment of the ciliary body under UBM is an effective method to treat contusion cyclodialysis cleft .