PROBLEM TO BE SOLVED: To provide a method for improving a dissolution rate of a powder-water soluble polysaccharide to a water system solvent, and a method for producing a water soluble polysaccharide solution.SOLUTION: There is provided a method [1] for improving a dissolution rate of a powder-water soluble polysaccharide to a water system solvent, which comprises, to a powder-water soluble polysaccharide, adding 0.01-20 mass% (to the powder-water soluble polysaccharide) of particulate inorganic oxide having a volume median diameter of 1-23 &mu；m and a method [2] for producing a water soluble polysaccharide, which comprises, to a powder-water soluble polysaccharide, adding 0.01-20 mass% (to the powder-water soluble polysaccharide) of particulate inorganic oxide having a volume median diameter of 1-23 &mu；m, followed by dissolving in the water system solvent.【課題】粉末状水溶性多糖の水系溶媒に対する溶解速度を向上させる方法、及び水溶性多糖溶液の製造方法を提供する。【解決手段】［１］粉末状水溶性多糖に、該粉末状水溶性多糖に対して０．０１～２０質量％の体積中位径が１～２３μｍの微粒無機酸化物を添加する、粉末状水溶性多糖の水系溶媒に対する溶解速度を向上させる方法、［２］水溶性多糖溶液を製造する方法であって、粉末状水溶性多糖に、該粉末状水溶性多糖に対して０．０１～２０質量％の体積中位径が１～２３μｍの微粒無機酸化物を添加した後に、水系溶媒に溶解させる、水溶性多糖溶液の製造方法。【選択図】なし
