Study on influencing mechanism of emergency on circulation has the vital significance on disaster prevention and post-disaster reconstruction.Based on agricultural emergencies,domestic and foreign relevant research and disasters of economic analysis method,this paper introduced the ways for emergency to spread, constructed a basic framework of citrus circulation and analyzed the influencing mechanism of snowstorm frost and big fly event on citrus circulation.The results showed that the impact of snowstorm frost on citrus circulation mainly focused on transportation and market while the big fly event influenced the citrus circulation owing to the selection of consumers’ psychological reaction and behavior mode.This paper finally put forward several countermeasures,such as intensifying propaganda and education to improve citrus farmers consciousness and ability of disaster prevention and mitigation; perfect citrus industry chain; construct a citrus disaster warning system; establishing an agricultural emergencies mechanism by governments at all levels,strengthening citrus fruits guarantee system and establishing permanent industrial emergency management departments.