Abstract: Objective To investigate the therapeutic effect of argon green laser for improving the visual acuity and relieving diabetic macular oedema in patients with diabetic retinopathy (DR). Methods In patients with preproliferative DR (PPDR) and proliferative DR (PDR), fundus fluorescein angiography (FFA) was performed to locate the area or spot where leakage occurred, followed by argon green laser photocoagulation of the identified leakage. In the 1-year-long follow-up study, both the visual acuity and changes in diabetic macular oedema were observed in both groups. Results Altogether 136 eyes (86 cases) were treated with argon green laser photocoagulation, and 87.50% of them showed improvement or maintenance of the visual acuity, and 87.95% showed alleviation of diabetic macular oedema. Better therapeutic effects were achieved in PPDR than PDR group, with statistically significant difference. Conclusion Argon green laser can be an effective treatment modality for diabetic maculopathy and may improve or maintain the visual acuity of the patients, but the effects can be related to the stage of the disease. Earlier intervention ensures better results.