Abstract: To investigate the law of mine pressure behavior in the mining process of large mining height supper-long working face, this study took the 2102 fully-mechanized mining face of the Balas Coal Mine as the background and used the PHASE^2D finite element software to assess the impact of working face length on the stability of the overburden rock.By establishing three models with working face lengths of 300 m, 350 m, and 400 m, the author analyzed the evolution of plastic zones in the overburden, surface subsidence, and the distribution of support pressure in the protective coal pillars under dual working face mining.The research results show: with the increase of working face length from 300 m to 400 m, the width of the plastic zone significantly expanded, increasing from 14.66 m to 25.79 m after the excavation of working face A,and the further increase of plastic zone after the excavation of working face B;when the working face length increased from 300 m to 400 m, the surface subsidence after the excavation of working face A increased from 0.19 m to 0.41 m, and further increased due to the cumulative effect after the excavation of working face B;the peak abutment pressure of the protective coal pillar after the excavation of working face A were 66.72 MPa, 70.17 MPa, and 83.12 MPa, respectively, and the maximum peak value after the excavation of working face B was 155.30 MPa.The results indicate that the increase in working face length intensifies surface subsidence, the expansion of the plastic zone, and the abutment pressure of the protective coal pillars.