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Diabetic macular edema(DME)is the foremost cause of vision impairment and even blindness in patients with diabetes mellitus. Nowadays, the approach in the treatment of DME involves laser photocoagulation, intravitreal injections of anti-VEGF agents or triamcinolone acetonide. However, they still have some limitations. In recent years, dexamethasone intravitreal implant, as a new treatment option, has brought therapeutic hope to DME patients who have poor response to other methods. Meanwhile, it has the advantages of good clinical efficacy, long duration, acceptable safety and good patient tolerability. In this paper, the research advances in dexamethasone intravitreal implant for DME are described.