Abstract: The formation of public opinion in major emergencies is a complex process,which should be guided by the core theory of Marxist journalistic view and Xi Jinping's important thought of news and public opinion.Its formation mechanism should be accurately understood and the innovative way of thinking should be adopted so as to solve the difficult problems such as the unknown situation,common people's concern,pluralistic thinking,insufficient concentration and so on.By adhering to the leadership of the Party,strengthening cultural self-confidence,assuming the responsibility of a great power,giving full play to the effectiveness of the dissemination of public opinion,and guiding public opinion in major emergencies to the mainstream ideology,we may do a better job in guiding public opinion efficiently.

Key words: major emergency, public opinion, formation mechanism, guiding principle, guiding path