Abstract: The paper introduced application status of intrinsically safe type explosion-proof system of field bus in automation system of petrochemical and coal industry, pointed out existing problems of application of intrinsically safe type explosion-proof system of field bus in automation system of coal production in China, and indicated that the application of intrinsically safe type explosion-proof system of field bus in automation and communication system of coal production in China is feasible, while it is needed to make protocol standard of field bus which is suitable for coal production of China and change exsited system authentication to parameters authentication.