Abstract: In order to reduce and avoid gas explosion accidents, find out the causes of accidents, prevent and reduce gas accident rate, this paper introduces the propagation mode and characteristics of gas explosion. On this basis, it expounds the investigation method and test technology of gas explosion. Through analysis of explosion gas, initiation position, leakage point and leakage cause, it completely describes the whole explosion accident investigation and test technology. The study can provide a technical support and investigation means for gas explosion accidents, and lay a foundation for the accurate investigation of gas explosion accidents.

Key words: gas explosion, leakage cause, initiation area, ignition source