The systematical study has been performed on the extraction conditions of pigment from Bingtang Orange peel,as well as the effects oftemperatures,pH,sunlight,oxidizing agent,reducing agent,metallic ions on its stability.Results showed that high yield of pigment could be obtained by the extraction with 95 % alcohol solution(pH 5.0)for 6 h at 60 ℃ and a solid-liquid ratio of 1:8(g/mL).The pigment has good heat resistance at pH 2-8.Its degradation would be accelerated by the influence of sunlight.Such metallic ions as K^+,Na^+,Mg^2+,Zn^2+...