Abstract: We summarized the hidden danger which is from original Xiamangou Coal Mine gob（fire zone）that was abandoned and close to 1402 auxiliary transportation roadway of Xin'an Coal Mine. In order to prevent the CO gas from original Xiamangou Mine goaf (fire zone) through the fractures inbursting into the 1402 mining face and affecting the safety of mining, we not only blocked the fractures of the protective coal pillar, but also realized the solidification coal (rock) body role by implementing the technique of grouting solidification protective coal pillar carcks to achieve an ideal effect that CO and other toxic and harmful gas from primary Xiamangou Mine goaf（fire zone）can not swarm into the 1402 work face.