AIM:To observe the therapeutic effect of poly-wavelength krypton lasers on the branch retinal vein occlusion (BRVO),and discuss its therapeutic significance for treatment of BRVO. ·METHODS:One hundred and forty-two patients 142 eyes with BRVO were treated with poly-wavelength krypton lasers. The changes in visual acuity,IOP were observed,and slit-lamp,ophthalmoscope,FFA were applied after 3 months. The changes in visual acuity,absorp-tion of retinal hemorrhage,macular edema were analyzed. ·RESULTS:Retinal hemorrhage was absorbed more than 1/2 in 51 eyes(35.9%),between 1/2 to 3/4 in 62 eyes (43.7%),and completely absorbed or more than 3/4 in 29 eyes(20.4%). Macular edema disappeared completely in 33 eyes(23.2%),reduced partially in 96 eyes (67.6%) and absorbed lightly or unchanged in 13 eyes(9.2%) after photocoagulation. Retinal neovascularization disappeared completely accounting for 71.2%,disappeared partially accounting for 28.6%,only 0.2% cases were increased or unchanged in FFA after 3 months. ·CONCLUSION:Retinal photocoagulation with poly-wavelength krypton lasers on BRVO promptly can improve visual acuity,promote absorption of retinal hemorrhage or macular edema,and avoid serious complications.