The purpose of this paper was to investigate the inulin hydrolysis at the simulated gastric juice so that it could benefit to understand the effect or behavior of inulin in the gastrointestinal tract.10% Inulin solution was prepared.The pH value of the simulated gastric juice were controlled by hydrogen chloride.The hydrolysis was conducted from 30 to 120 min between 36 and 37.0℃,at pH 1 and 2.The fructose was determined based on Seliwanoff reaction.The hydrolyzed rate were detected by the 3,5-dimtrosalicyclic acid assay for reducing sugar.