Gas accidents are increasing every year, whereas the amount of using gas has been sharply increased due to conveniences, low-pollution, thermal efficiency of the gas. Gas accident has been recognizing serious social unstable elements as well as incredible economic damages of casualties of men and properties. For the prevention of the accidents, basic pre-countermeasure must be arranged to reduce gas accidents. The purpose of this study is to find out the strength of preliminary preventable functions against gas accidents throughout reformation of laws and regulations for insurance related in gas laws.