With the deepening study of quercetin, some studies show that quercetin can protect lens, with pharmacological activities such as antioxidation and anti-apoptosis and so on. And they can delay the occurring and developing of cataract. The development and utilization of the quercetin will be expected to be a new means of prevention and treatment of cataract.The article takes in the research progress of that quercetin on the lens with antioxidation, inhibiting aldose reductase and anti- apoptosis and its mechanisms.