Abstract: According to the incomplete samples of gas explore accident in underground coal mines from 1950 to 2009, the gas explosion has been a threat to coal mines. In order to explore the influence of unsafe act on the accident in the process of blasting operation. The mine blasting operation, divided into 13 procedures and 44 acts based on standards and field experience, is an act chain to explore safely. After taking a comparison between the unsafe acts in the 218 samples nearly 60 years and the safe act chain, then the management vulnerability in blasting operation in coal mines can be found. The result shows that such key procedure like “hole sealing” and key acts like “the first gas examination” cause 88% accidents, and that the main points to prevent gas explore accident during blasting operation is management vulnerability optimization.

Key words: blasting operation, gas explosion, unsafe act, management vulnerability, accident prevention