In order to get the liquid detailed process and flow law, improve the grouting and filling compaction degree and the filling mining reliability, physical simulation experiment technique was adopted, the characteristics of the physical prototype were concluded and analyzed. According to the liquidity characteristics of high water material slurry, the physical prototype model was designed as a series of grouting. The grouting junction entity was studied, using the mathematical methods of linear regression, high water material in the loose rock body movement spread rule was summed up when the ratio in the laboratory and the velocity v = 3.9 m3 / min. It was concluded that high water material slurry flow in the loose rock body radius and the relationship between the flow rate per unit time was y = 34.8 x0.6, reasonable distribution of filling grouting borehole was analyzed to improve filling compactness and reduce surface subsidence.