Abstract: It is hard to keep the gas from gathering because of the traits of mine itself, and there often occurs in mines the high-risk work of gas drainage, which is strictly stipulated by Mineral Security Regulations. It is vital that rigorous measures be made and the influencing range be determined before gas drainage. The study introduces the topological function of AutoCAD Map and proposes the new thought of ascertaining the influence area of gas drainage with the network topological connected tracking function of AutoCAD Map. The approach has been applied in the mine in the county of Lee and gained good results.

Key words: gas gathering, gas drainage, influence area, AutoCAD Map, network topology