Abstract: By analyzing the hierarchy of safety factors in an oil depot, five categories are identified, that is, personnel, safety administration, store equipments, station equipments and over loading. The method for analyzing hierarchy process (AHP) is used to confirm the weights of evaluation factors, and the overall evaluation method based on the fuzzy analysis is used to evaluate the risk grade, and finally, the accident risk evaluation result for liquid propellant store is obtained. The result indicates that the risk degree is in the second level, which means a “bigger” risk and a hazard process. And the key point in the calculation is the safety administration aspects, with the human ability, over loading as well as the contingency to follow in order of importance. Finally, some comments are made on how to prevent accident.