Abstract: Grout control is a significant problem in the process of water inrush grouting in coal mine. Grout outflow result in waste material, long rescue period, high cost of the project, a large amout of dredging, long time for restore production. Taking the 2302 work face grouting engineering of Shenjiazhuang coal mine as an example, paper analyzed and summarized variety of methods to control the grout outflow under the condition of hydrodynamic grouting. Engineering practice indicated that hydrodynamic grouting can be controlled by water flowing velocity, grout flowing, grout performance, grouting mode and so on. Water flowing velocity can be used to control by Building retention wall. Grout flowing can be controlled by dropping aggregate material and building coal bag wall. Grout performance can be controlled by injecting dense grout. And grouting mode can be controlled by intermittent grouting.