Abstract: In view of the control problem of surrounding rock of irregular working face in steeply dipping coal seam, combined with the mining characteristics of steeply dipping coal seam, the numerical calculation model of the irregular working face of steeply dipping coal seam was constructed, and the dynamic evolution of abutment pressure in irregular working face at different inclination angle was studied. The results show that the dynamic evolution process of irregular working face is consistent with that of inclined abutment pressure, the formation and evolution of abutment pressure in the upper, middle and lower regions of irregular working face are inconsistent under the influence of coal seam inclination; the abutment pressure in the connection section of the working face within the range from 10 m to 40 m is excessively concentrated; the advance abutment pressure in the middle of the working face is the largest under the influence of coal seam inclination; the evolution of the advanced abutment pressure has gone through five stages; when the working face advances to 70 m and 140 m, the advance abutment pressure appears peak value.