CCTV host Zhao Pu posted a message and made the “freezing yoghourt event” exposure and caused the social public condemnation on food safety in China. As a network opinion leader，Zhao Pu played a “gatekeeper role” in the “freezing yoghourt event”，and provided the source for the spread of event. In the formation of public opinion，Zhao Pu succeed in causing internet users and media’s attention and persuading them don’t eat freezing yoghourt. He played a very important role in affecting network opinion of food safety in our country. Therefore，the government must attach great importance to the role of opinion leaders in guiding network opinion of food safety and making food safety policy. In addition，since opinion leaders of micro-blog has entered the public space，they should undertake the social responsibility of speaking in public space. Opinion leaders has the influence of network opinion，if they forward of post false information，they may be mislead the audience and cause adverse social impact. Furthermore，opinion leaders should cherish their voice.