Internet rumors bring endless troubles to the government on social governance. The emergence of "micro-blog" facilitates the spread of rumors. By analyzing typical rumors spread on micro-blog from February, 2017 to February, 2018, this paper sums up difficulties in the practice of dispelling rumors, and puts forward a set of methods which can refute rumors from three aspects, cultivating the rumor awareness of netizens, establishing an emergency disposal system for preventing and controlling key rumors, and coordinating public powers.