Preparation of ginseng concentrate with high content of acidic polysaccharide from white tail ginseng marc that was obtained after preparation of white tail ginseng extract. As a result of extraction of white tail ginseng under various concentrations of ethanol (0∼90%), both amount of acidic polysaccharide and extraction yield decreased by increasing the ethanol concentration. However, acidic polysaccharide extracted by water from white tail ginseng marc was increased in accordance with the increase of ethanol concentration. The optimal condition for the extraction of acidic polysaccharide from the marc was treatment of $alpha$-amylase in 390∼650 unit/g residue/15 mL of distilled water for 5 min at 4$0^{circ}C$. The amount of acidic polysaccharide in water extract of the marc was increased from 8.3% to 10.5% by the treatment of $alpha$-amylase. A new ginseng extract mixture was manufactured by mixing 50% ethanol extract of white tail ginseng and water extract of alcoholic residue in the ratio of 8:2 (w/w). Crude saponin content and acidic polysaccharide content were 10.5% and 17%, respectively. The mixture had a same crude saponin content and twice acidic polysaccharide content comparing to 50% ethanol extract of white tail ginseng. It suggests that preparation of new ginseng concentrate with high content of acidic polysaccharide from white tail ginseng marc has high potencies in the utilization of waste material.