Abstract: In order to ensure the safe transportation of dangerous goods on board, a risk factor identification model was built for containerized dangerous goods on board based on the degree of combination importance by using both the FTA and the level importance analysis methods. For building the model, the accident risk factors were identified according to the analysis of the typical accident cases of dangerous goods on board, a fault tree of dangerous cargo transportation was established, and the key factors of risk were calculated by the critical probability importance. The hierarchical importance degrees of the factors were analyzed by using the hierarchical importance analysis model of the key factors, and then the key factors leading to risk were got. The results show that there are 6 key factors such as improper packing, excessively high ambient temperature and bumps during transportation, and that both improper packing and excessively high ambient temperature as the lowest sensitivity factors have a greater impact on the probability of accidents during cargo transportation.

Key words: dangerous goods, container transportation, fault tree analysis(FTA), risk identification, degree of combination importance