In order to analyze and study the design feasibility of support scheme and the stability of support effect of the bottom extraction roadway in Changcun Mine, the method of numerical simulation was used to carry out the research. According to the selection and experience of the previous support parameters, the support parameters of the bottom extraction roadway were designed, and the numerical simulation research was carried out according to the simulation parameters. The stability of surrounding rock and the stress of supporting structure after simulated excavation and support were analyzed. The results showed that the influence of mining dynamic pressure on 2305 bottom extraction roadway was obvious, the deformation of roadway was mainly the deformation of roof and left side, and the vertical stress of surrounding rock in 2305 bottom extraction roadway was 18MPa, slightly higher than the original rock stress; the stress of two side bolts was obvious, some bolts reached their ultimate load, while the roof was slightly higher, the stress of the anchor cable was too small, so the next step was to strengthen the monitoring of the mine pressure and adjust the supporting parameters of the roadway in time.