The criticality of fire and explosion potentially existing in oil storehouses in an objective and reasonable way is evaluated. The evaluation method parameterized by the hazard indices of fire and explosion and authorized by Dow Chemical Company U.S.A. The latest version 7.0 is used in the oil storehouse of a certain company. The evaluation results are turned out to be objective
reasonable and convincing. To run the oil storehouse safely is based on allaround safety precautions.