AIM:To analyze the features of traumatic cyclodialysis cleft by ultrasound biomicroscopy(UBM) and summarize the results of ciliary body suture with UBM in traumatic cyclodialysis cleft·METHODS:Totally 30 eyes of 30 patients with post-traumatic ciliary body detachment were diagnosed by UBM examination,with the localization and range of cyclodialysis cleft.Among them,5 eyes of 5 patients were treated with ciliary body suture according to the results of UBM examination.Patients were examined postoperatively on visual acuity,intraocular pressure(IOP),and UBM and ultrasonography re-examination·RESULTS:All patients had cyclodialysis detachment,90%(27/30)had full cyclodialysis detachment,and 87%(26/30)had cyclodialysis cleft,the mean ACD was(1.830±0.575)mm.5 patients of them had been treated by ciliary body suture with UBM.The IOP of 4 patients was normal after the first surgery,the IOP of 1 patient was normal after the fourth surgery.Ciliary body of all patients after surgery was adhered to sclera,anterior chamber was deepened,and visual acuity was improved·CONCLUSION:UBM is a useful method for appropriate diagnosis of traumatic cyclodialysis cleft.Ciliary body suture with UBM is an effective surgery for treatment of traumatic cyclodialysis cleft.UBM can be of great value in the diagnosis,management and follow-up of patients with traumatic cyclodialysis cleft.