Extraction effect of soybean oligosacchride in various solvents was compared using cooled defatted soybean meals as raw material.The better conditions were:1%Na2CO3，extraction temperature 55℃ and extraction time 2 hours.After being dissolved by alkali then being precipitated by acid,remaining protein was removed by Ultrafiltration(UF) and through orthogonal tests.The optimum condition was:25℃,pH6.3,and membrane prssure 20 psi.The product was obtained by concentrated under vacuum after desalting by ion exchange.%本文以低温脱脂大豆粕为原料，比较了多种溶剂对大豆低聚糖的浸提效果，确定较优的浸取条件为：1%Na2CO3，温度55℃，时间2 h．经碱溶酸沉后的乳清液，采用超滤法除残留蛋白，通过正交实验确定的纯化条件为：温度25℃，pH值6.3，膜压力20 psi．离子交换脱盐后，经真空减压浓缩得到产品．
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