Abstract: Using 95% ethanol and 1.5% hydrochloric acid (1:1) as soaking liquid, by single factor test and orthogonal test, the optimal microwave extraction conditions of anthocyanin pigment from black kidney bean are determined as follows: microwave power 500 W,extraction time 45 s, ratio of material to soaking liquid 1:20 and extraction times 3. Owing to the functional properties of the pigment, it can make food coloured with some antioxidant and bacteriostatic effects.

Key words: black kidney bean, pigment, extraction, property