Parameters setting is very blindness in bolt support which based on traditional engineering analogy in coal seam, especially in large cross section roadway support, which causes many security risks. Taking Nanyangpo coal for example, the paper analyzed the problem in the coal tunnels support and proposed three kinds of supporting programs based on the nature of physical mechanics of coal and rock, used Flac3D software to execute numerical simulation and analyze the stress distribution and vertical displacement and plastic deformation of the surrounding rock of different options, and determine reasonable support program. The paper finally analyzed the feasibility of the new support program and adjusted timely, through monitoring the displacement of deep basis points in the roof and sides.