Abstract: For the problem of “three unders” mining with high cost and complex process, based on a mine under building covering 9^# coal seam, short wall cemented filling and skip mining was proposed. We study synergy mechanism and movement laws of surrounding rock about coal pillar filling body by this mining method. The main conclusions are as follows: the design width of support roadway length and advancing length of working face are respectively 5 m and 90 m in full thickness mining; firstly, the ratio of mining and pillar being 1∶3, the maximum deformation of roof is 14.1 mm, in a wavy distribution, and the bottom deformation is not obvious; secondly, the ratio being 1∶1, the maximum deformation of roof and floor is 30.9 mm, 2.3 mm respectively; thirdly, full mining and full backfilling, the roof displacement is concave shape and the maximum deformation of roof and floor is 109.1 mm, 10.3 mm respectively; in the mining process, stress distribution of coal pillars is staged and gradually transferred to deep. Backfilling stress presents step-shape increase skip; overburden are mainly bent down after full mining and full backfilling, and the direct roof has no obvious caving process. Destructive floor renders W-wavy distribution with 0 to 2.2 m failing zone and the plastic zone on both sides of the coal pillar is located at 1.0 m.