n order to better study the excavation and support of tunnels in coal-bearing strata, a two-dimensional elastic-plastic constitutive model of Mohr-Coulomb is established by using ADINA numerical simulation method for the excavation and support of tunnels in large cross-section coal-bearing strata. The excavation and support process of Large Cross-section Tunnels in coal-bearing strata is analyzed, and the displacement field, stress field and its distribution law during the excavation process are revealed. The calculation results show that the step excavation method is beneficial to the stress release and stability of the tunnel in the coal measures stratum. At the same time, one support, secondary support and lining are used on the support.. On-site construction monitoring reflects the tunnel excavation and support parameters of coal measures stratum, which is a weak rock stratum. It can be seen that this provides certain theoretical and field guidance for tunnel construction under similar conditions.