Abstract: 【Purpose/significance】The wide spread of rumors in the government's new media public opinion field in major emergen⁃cies will cause social panic, intensify social contradictions, and affect social stability and unity. To this end, it is necessary to study the rumors in the public opinion field, prompt them to be reduced as soon as possible, and minimize their adverse effects.【Method/pro⁃cess】First, based on the analysis of the types of rumors in the government's new media public opinion field and the reasons for the spread of rumors, this paper divides the spread of rumors into five stages: generation, diffusion, climax, reduction and calm. Then, it analyzes the influence of residents' emotions and media literacy on the spread of rumors in the government's new media public opinion field, and combines the importance and ambiguity of the rumor ontology to construct the spread, diffusion and reduction model of ru⁃
mors in the government's new media public opinion field. Finally, taking the new crown epidemic as an example, the constructed model is verified.【Result/conclusion】The empirical results show that the importance of events, ambiguity and residents' emotions are the main factors that promote the spread of rumors, while media literacy has an inhibitory effect on the spread of rumors. Based on this,this paper proposes relevant governance strategies for the rumors in the government's new media public opinion field for major emer⁃gencies.【Innovation/limitation】This study provides some help for effectively controlling rumors and ensuring social stability and unity. However, due to the single case, the verification results are relatively limited, which can be further deepened in the future.