In order to study pressure law of dynamic pressure roadway in deep thick coal seam, theory analysis, numerical simulation and field measurement were used to analyze it. The results showed that roof subsidence, roadway stability and stress around the tunnel were related to size of sectional area. The numerical simulation showed that 50 m distance in front of working face was affected by mining, and the change would be more severe in 50 m behind lagging face, distance from 50 m to 150 m still had stress increasing. The 14103 roadway was affected by adjacent working face and its intense area was 47 m ahead of working face. The severe area affected by this working face was within 8 m ahead of working face. High preloading and high strength bolts was used in deep coal seam support, and coal seam residual strength was strengthened.