Method for Protect of the river levee was method for installing concrete revetment block and concrete mat method in Korea. But this method is non-environmental approach because the vegetation can not take at all. To solve these problem, the method has been applied using porous vegetation concretes. Porous vegetation concrete has filler technique to provide water retention and nutrient a into the porous interior in order to facilitate plant growth. But filler used increasing the cost and the construction period. Therefore in order to not use a filler, a high absorption rate and good absorption capacity needed aggregate. Current, Blast furnace slag aggregate has been used in architectural and civil engineering field as an alternative aggregate resources. Blast furnace slag aggregate is high absorption rate and lighter in weight per unit. This study evaluated the absorption capacity of the blast furnace slag aggregate. Phosphorus Sorption experiment was carried out to produce a cylindrical acrylic(diameter 11cm, height 90cm). There filling the aggregate, for supplying the test solution was using as a pump from bottom to top. And The water of having passed through the solution was analyzed. Results, blast furnace slag aggregate showed absorption capacity of 64~77% of PO43-P and T-P. Crushed aggregate show absorption capacity of 6~24% of PO43-P and T-P. Blast furnace slag aggregate showed excellent result of good absorption capacity compared to the crushed aggregate showed excellent result.