Microwave method was used to extract astragalus polysaccharides fromβ-cyclodextrin and its derivatives.Under simulated human gastric juice,the removing capability of astragalus polysaccharides on the nitrite was determined by spectrophotometry.The experimental results indicated that β-CD can improve the capability of scavenging sodium nitrite from 29.1% to 50.2%,and the optimum conditions for the extraction were as follows: microwave power 455w,extraction time 2 min and the removing capability of astragalus polysaccharides to the nitrite was 51.4%.