Abstract: The retractable pier column is a new roadway supporting body which is supported by coal mine roadway. It is also one of the most concerned issues in the inclined face. It is of great theoretical significance and application to carry out this research. value. Based on the background of Fengfeng Group Wutongzhuang 182208 working face, combined with the special structure of the steel pipe nesting in the upper and lower sections of the pier column, the mechanical model is established, and the stress condition is analyzed. Angle of the formula. The results show that the size of the pillar of the pillar is related to the thickness of the old roof, the direct top and the angle of the face. The angle of the mountain and the roof and the vertical top are exponential, and decreases with the increase of the thickness of the old roof Small, with the increase in the thickness of the direct top. Through the field test results, when the mountain angle is 2.4 °, it can effectively control the bending deformation of the pier structure and improve the bearing capacity of the pier.