The effect of the grain size of the konjac superabsorbent polymer (KSAP),the pH of the solution,the different kinds of fertilizer on the absorbent ability was studied,and water activity of different water absorbenctgel was measured and compared with that of root.A preliminary application in water conservation forestry was also at temptd.The results indicated that the water absorption ability of the resin was the best at the pH value 6~8 and the grain size about 1 mm.The effect of different fertilizers on the water absorbent ability of KSAP followed the order of(NH₂)₂SO₄>KH₂PO₄>Na₂SO₄>KNO₃>KCl>(NH₂)₂CO>(NH₄)₂SO₃>donized water.When KSAP water absorption was greater than 100 folds,the water activity is higher than that of plant roots,suggesting KSAP cannot only provide adequate moisture for plant growth.but also effectively slow down the natural loss of moisture and evaporation.