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Background Retinal pigment epithelial (RPE) cell is a monolayer of multifunctional cells between the retina and the expression of inducible nitric oxide synthase (iNOS) and complement 3 (C3) via Fas/FasL pathway in RPE cells and the values of puerarin as a therapeutic target for inhibiting the apoptosis of RPE cells.flow cytometry was used to determine the apoptosis of RPE cells. Immunohistochemistry and West blotting were used to determine Fas/FasL signal transduction. Gene array analysis, reverse transcription polymerase chain reaction (RT-PCR) and West blotting were used to determine the expression of iNOS mRNA and iNOS protein in RPE cells.Results There were minor expression of NT, C3, Fas/FasL and iNOS mRNA in control group, and strong expression of down-regulated in puerarin group (P＜0.001).damage on RPE cells. The antagonizing mechanism of puerarin may be related to its inhibitory to the expression of iNOS puerarin may be an useful therapeutic agent against apoptosis of RPE cells.