Abstract: Applying theoretical calculation and numerical simulation to researching rational width of small coal-pillar along gob in 4310 full-mechanized caving mining face, plastic zone range and stress distribution characteristic of coal-pillar under different coal-pillar widths was analyzed.Combining actual geological and mining condition, rational coal-pillar width was determined to be 10m.According to current supporting theory, deformation control of surrounding rock of 4220 roadway was selected.By numerically analyzing deformation characteristic of roadway influenced by mining, supporting projection of anchored bolt and cable with high pre-stress and high strength and supporting parameters were obtained.Practice showed that supporting effect of the supporting project was obvious which improved coal mining ratio and provided reference for later driving roadway along gob.