Abstract: Taking the interval mining method in mining upper seam of shallow buried ultra-close coal seam group with flat landform of Nanliang Mine as research background, this paper studies the effect of interval pillars remained in upper coal seams on stress distribution laws of lower seams with the combining method of theoretical analysis and numerical simulation. The software RFPA was used to simulate upper seam mining and analyzed stress distribution laws of elastic core of pillars in combination with theory of half infinite plane, lithology of roof and floor and mining technology parameters at 20303 workface. The horizontal, vertical and shear stress distribution laws of single and combined interval pillars were analyzed by contrast.