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This paper studies the evolution rule of inclination fracture field in close distance and inclined coal seams. It can fully understand the evolution rule and distribution characteristics of overlying strata in the coal cutting process. Taking the 21003 mining face of a mine in Guizhou as the engineering background, numerical simulation is used to simulate the evolution process of the overlying strata fracture field and deformation characteristics caused by the mining effect of the mining roadway during coal cutting. Finally, it is concluded that "triangular closed" structure at the bottom of mining face greater than upside during mining face, resulting in a large deformation of the roadway at the bottom of mining face; the composite support technology can effectively control the large deformation of surrounding rock roadway caused by the "triangular closed" structure. [ABSTRACT FROM AUTHOR]