In order to obtain the preparation technology of soluble dietary fiber , naked oat bran was used as raw materials by acid modification of enzymatic methods in this paper. Optimum conditions for extracting the soluble dietary fiber in the raw materials were confirmed through orthogonal tests. The results showed that optimum condition of the naked oat bran was as follow:the ratio of material to water 1∶20 (g/mL), pH 4, extracting temperature 50℃and extracting time 150 min. Under this condition, the extracting rate of soluble dietary fiber was 11.07%.It achieved some progress compared with preparation technology before.%以莜麦麸皮为原料，运用化学法中的酸法对其中的不溶性膳食纤维进行改性，再通过正交设计，优化pH、料液比、温度和时间这四个因素，以确定酸法改性的最佳工艺。经过试验分析，当料液比为1∶20（g/mL），酸解pH为4，酸解温度为50℃，酸解时间为150 min时达到最优效果，此条件下水溶性膳食纤维的得率为11.07%，对比以往得到了一定的提高。
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