Objective：To observe the changes in the anatomy of anterior segment before and after phacoemulsification for treatment of angle-closure glaucoma by Pentacam system,so as to assess the efficacy of phacoemulsification combined with artificial lens implantation(ALI) in treatment of early- and middle-stage angle-closure glaucoma.Methods:Forty-two patients with early- and middle-stage angle-closure glaucoma(44 eyes) were included in the present study.The central anterior chamber depth,anterior chamber volume and peripheral anterior chamber angle were examined by Pentacam system pre-operatively and 1 day,1 week and 3 months post-operatively.Meanwhile,A ultrasound was used to examine the anterior chamber depth before and 3 months after operation,and the results were compared with those by Pentacam system.Results: Pentacam system could clearly demonstrate the 3-dimensional structures of the anterior eye segment before and after operation.The central anterior chamber depth,anterior chamber volume and anterior chamber angle were increased significantly after operation(P<0.01); the intraocular pressure was significantly decreased(P<0.01); and the visual acuity was improved(P<0.01).The values of central anterior chamber depth and the dispersion coefficient obtained by Pentacam were smaller than those by A ultrasound.Conclusion: Pentacam system can directly demonstrate the increase of anterior chamber depth,anterior chamber volume,and anterior chamber angle after phacoemulsification combined with ALI in treatment of early- and middle-stage angle-closure glaucoma.It is a safe method for early examination after operation.