In order to explore the reasonable width of coal pillar and surrounding rock control technology of mining roadway in close distance coal seam working face, this paper takes the mining of 10# coal seam and 11# coal seam of Huipodi coal mine as the engineering background, through numerical simulation, theoretical analysis, field practice and other technical means, the evolution process of coal pillar failure, influencing factors, damage range of floor under different width conditions are analyzed. The surrounding rock control technology of mining roadway is studied in depth. The results show that: (1) During the four stages of reserved coal pillar, section coal pillar, protective coal pillar and isolated coal pillar, the damage scope of coal pillar gradually increased; The proportion of elastic core of coal pillar increased with the increase of coal pillar width, the mining roadway in this coal seam evolves from asymmetric failure to symmetrical failure. The failure width of coal pillar is inversely proportional to coal seam dip angle, cohesion, coal pillar width, internal friction angle and poisson's ratio, but only proportional to buried depth. (2) With the increase of coal pillar width, the width and depth of coal pillar floor failure increase, and the floor failure concentrated on the side of coal pillar edge, and the floor damage area under the coal pillar is small. (3) The maximum principal stress under the floor deflects due to the concentrated stress of the coal pillar, and the maximum principal stress points to the direction of the coal pillar. With the increase of the distance between roadway and coal pillar edge, the plastic zone of roadway surrounding rock changes from inclined "X" type distribution to inclined "8" type distribution, then to inclined "O" type distribution, and finally to elliptic distribution. When the distance from coal pillar is close, the roadway often shows asymmetric failure, and the support should also take the form of asymmetric support.