Abstract:Oil depot is a place for oil storage. Oil is dangerous because of its flammability and explicability. The main work of objectively and correctly evaluation of oil depot is to determine weight of each factor like staff, equipment, environment and management affecting oil safety precisely. The importance of fuzzy comprehensive evaluation was discussed in this article and a new weight matrix calculation approach was proposed. The result of fuzzy comprehensive evaluation showed that health conditions and professional skills of staffs are main factors affecting oil depot safety. Therefore, it is necessary to improve both health conditions and professional skills of staffs to ensure oil depot safety. This method for safety assessment is more available, objective and accurate.