Abstract: The exploitation and multipurpose utilization of coal seam gas is benefit to ameliorate the mine safety and production,protect the ecological environment,reduce the illogicality of the supply and requirement and so on.This paper bring forward to draining mainly gas by the mine shaft,auxiliary by the ground drill hole according to the coal seam gas migration and accumulation,based on the analyses of the micromechanism,permeability,isothermal adsorption,pressure and methane content of coal seam in mostly mining area.In view of the characteristics of exploring and utilizing situations of coal seam gas in each mining district,the suggestion for exploring and utilizing coal seam gas in chongqing is extracted.