Large scale commercial website is one of the most important network media in all of the information media，so it is very important to study its social responsibility.On the basis of empirical data，qualitative and quantitative methods are used to construct the index system of the social responsibility of the commercial web site，and carry on the comprehensive evaluation of the social responsibility of the commercial website.The results show that the overall level of social responsibility performance is good，but there are still five major issues，such as agenda setting and ineffective public opinion guidance.On the basis of this，it discusses the effective way to improve the social responsibility performance of large commercial website.