China is known as the tradition of law can exchange with emotion，which is the important factors that public opinion can influence judicial judgment.In the judicial practice of our country，never exist the ideal problem whether the public opinion should influence the judicial，people should pay attention to is the real problem how public opinion to influence judicial is justified.In this context，there is no need to explore the necessity of supervision of public opinion to justice，but shall examine how the judicial supervision of public opinion is legitimacy，rationality，and promote the realization of judicial justice.