Based on Army Experiment and Persuasion Theory of Carl Hovland,this paper carries out the control experiment about how different information influences public attitude towards genetically modified foods(GMF) under the same or similar educational background.The result shows that different information has significant effects on public attitude towards GMF,but the direction is different.The public has the positive attitude towards GMF under positive information,and negative attitude under negative information,with the latter more influential than the former normally and even in a double-sided information circumstance.Therefore,this paper proposes to build a communication platform for GMF risk information,make the most of positive functions of experts,government and mass media,integrate the approaches for communication,select information for communication in a scientific way so as to make the public form a rational attitude towards GMF.