Abstract: For roadway driven in extremely thick coal seam，there are all coal seam around surrounding rock.In order to further study the deformation and failure characteristics of coal mass in extremely thick coal seam，to determine the effective support forms and parameters and ensure the safety in production，a roadway at Nanyangpo No.5 coal seam is chosen as a research object.It is a large section roadway with cross section form of circular arch 4.3 m wide and roof 3.4 m high.On the basis of determination of the roadway shape and size，roadway supporting design is made.Combining with the field monitoring and numerical simulation，an anchor-mesh-cable support is proposed.Engineering practice shows that：this method can effectively control the deformation of coal rocks around the roadway with good supporting effect.The two-side and roof displacements of roadway have been effectively controlled.The roadway deformation is leveled off in the short term.As well，the supporting cost is greatly reduced and the support period is reduced with anchor rod and anchor cable.This support method owns a high practical value and should be actively popularized in production.

Key words: Large section roadway, Support, Monitoring, Numerical analysis