Food safety risk communication has its special context in which every speaker should choose proper language style so as to manage the possible risk of misunderstanding. Fang Zhouzi and Cui Yongyuan took a different rhetoric strategy during their debates on genetically modifed food in the following aspects: identity positioning, persuasion, turn-taking control, pragmatic style. Fang Zhouzi did much better in the logic reasoning and logical expression than Cui Yongyuan but surprisingly he failed in the opinion polls. The failure lies in his ignorance of the suitability of language style and the context. In detail, he made three mistakes: 1. messed up the communication object of the public with the scientifc insider; 2. pursued wrong communication purpose for overwhelming the opponent rather than communicating with the public; 3. simply equaled the communication as reasoning argument thus ignoring the virtue, goodwill and perception of the public mood.