Taking the cement plant,the most widely distributed radioactive source user in Guizhou Province,as an example,combined with the relevant guidance documents of the Ministry of ecological environment on the radiation accident emergency drill,this paper summarized the development process of the county enterprise joint radiation emergency drill.Based on the requirements of the actual practice of the exercise,this paper discussed the key points of the emergency exercise of radiation accidents at the county level,and provided some reference for the county level ecological environment management department to carry out the emergency exercise of radiation accidents.