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In this paper, the authors discuss the polyacrylamide-aluminum citrate/water glass gel and set the gradient on the cross-linking agent aluminum citrate to study the cross-linking agent content of polyacrylamide-aluminum citrate/water glass gel. The influence of properties, viscosity, strength and resistance characteristics, found that the water retention rate, viscosity and strength resistance of polyacrylamide-aluminum citrate/water glass gel increased first with the increase of aluminum citrate. After the reduction. Among them, when the amount of the cross-linking agent aluminum citrate is 1.2 wt%, the polyacrylamide-aluminum citrate/water glass gel performs excellent in various aspects. The optimal ratio of polyacrylamide-aluminum citrate/water glass gel is finally confirmed, which provides theoretical support for its application in coal mines.