·AIM:To investigate the effect of krypton laser photocoagulation on branch retinal vein occlusion(BRVO)with comptications.·METHODS:All of 46 patients 46 eyes with complications of BRVO were photocoagulated by krypton laser ;26 cases with macular edema were performed grid laser photocoagulation;20 cases with neovascularization were performed diffuse laser photo-coagulation.The patients were followed up by fundus examination and fundus fluorescein angiography(FFA)for 3 months.Patients who still had macular edema or neovascularization after the first photocoagulation at the end of 3 months were performed second photocoa-gulation.·RESULTS:Macular edema disappeared and visual acuity improved by 2 lines in 28 eyes,visual acuity of 16 cases were the same as before photocoagulation,and 2 cases were decreased.In the 20 patients with neovas-cularization,neovascularization disappeared in 16 patients after the first photocoagulation,4 patients after the second photocoagulation disappeared.·CONCLUSION:Krypton laser photocoagulation is obviously effective in treatment of BRVO with cimplications.·