Abstract：The characterisitics of gas controlling are discussed in the three degree bend of arc structure based on the arc structure belt for gas enrichment and gas disaster division. The first degree and second degree bend control the occurrence characteristics,supply,transport and dissipation conditions of coal bed gas in the overall,the third degree bend and its accompanying transverse fracture control the plane distribution of coalbed gas enrichment area. The arc structural belt is composed of three degree bend. Examples of different districtions of Xu-Su arc structure belt such as Luling,Taoyuan and Suntuan coal mines show that there are reverse fault development,gas accumulation and serious gas disasters in the internal arc belt of arc structure belt,and there are separation fracture,normal fault development and lower methane gas content in outer arc belt.

Keyword：arc structure;Xuzhou-Suzhou arc structure belt;coal bed gas;characterisitic of gas controlling;