Abstract: In order to control the geological hazard of water-sand inrush in shallow buried and thin bedrock coal seam, the causes are analyzed. The results indicate that the hydraulic gradient is key factor for the hazard of water-sand inrush in water-rich sand seam, and the hazard of water-sand inrush will occur while current hydraulic gradient exceeds extreme hydraulic gradient. Based on the four essential factors of water-sand inrush, a new technology is researched, and it combines decreasing current hydraulic gradient with discharge water and increasing extreme hydraulic gradient with grouting in sand seam in roadway. Some tests were completed for the technology, and tests results reveal that the grouting material moves in the water-rich sand by wedging, extrusion and permeation and changes physical and mechanical properties of water-rich sand. The technology was applied in the Halagou Coal Mine to prevent the hazard of water-sand inrush, and it made the workface pass through the high-risk zone of water-sand inrush.