This book introduces the basic knowledge and engineering application of coal seam gas disaster prevention and control. The book systematically expounds many parts, including basic concept of coal seam gas, gas generation and occurrence characteristics, porosity and adsorption characteristics of coal, coal seam gas basic parameters, mechanical properties of coal and its seepage characteristics, coal seam gas migration and emission, gas disaster prevention and control in coal mines (gas outburst and gas explosion), coal seam gas reserves evaluation, coal seam gas extraction methods, design of gas extraction, coal seam gas utilization and so on. This book can be used by teachers and students of safety engineering, coalbed methane engineering, mining engineering and other related majors, and can also be used as a reference for the technicians of coal enterprises and researchers of scientific research institutes.