Abstract: Aiming at the specific geological conditions and mining technology modernization about Daliuta Mine, the method of similarity model test is adopted in this paper, the arrangement and stability about coal pillar dam for distributed groundwater reservoir in coal mine was analyzed and studied, the layout method of coal pillar for distributed underground reservoir is divided: in the vertical direction of the seam plane, including alignment arrangement and stagger arrangement; in the parallel direction of the seam plane, including short working face layout and long working face layout. Based on this, the reasonable design method of coal pillar dam was proposed: in the parallel direction of the seam plane, the layout of coal pillar was better, in this case, the fracture zone height caused by goaf of working face mining is smaller than the two seam spacing; in the vertical direction of the seam plane, the alignment top and bottom of coal pillar was better.