Abstract: 49 special gas explosion accidents since 2000 were selected as samples， Based on the accident causation "2-4" model and the PDCA cycle, The 7 kinds of unsafe actions, 6 kinds of unsafe state, 3 habitual behaviors and 7 main elements of safety culture were analyzed statistically. It is found that the causes of accidents are common and can be controlled by safety training. The key is to establish safety training system to train employees. For this reason, a particularly serious gas explosion accident was taken as an example to analyze the causes of the accident, and a safety training system was constructed to find the feasibility. Finally, based on the statistical data of accident samples, a safety training system for preventing especially serious gas explosion accidents was constructed, which included unsafe behavior training, safety culture construction and Deming ring inspection.