Research status: Diabetic retinopathy is the mean reason that lead to blindness in the working-age population.With the rapid economic development and people life style change,China has become a country with the largest number of people suffering from diabetes.With the increase of diabetes patients,and the increase of blinding rate,the active treatment of diabetic macular edema is very important.At the same time of systemic treatment,the laser complication is the most basic and effective treatment.