Abstract:In order to explore the relationship between betaine and antioxidant activity of red heart pitaya wines during storage and effective color control technology.The changes in betaine content and hydroxyl radical scavenging activities，reducing ability，and ABTS+radical scavenging activities of three red heart pitaya wines and commercially available red heart pitaya wines were studied.And correlation analysis between betaine content of fruit wine and its antioxidant capacity during the storage.The results showed that with the increase of storage time，the betaine pigment preservation rate of the red heart pitaya wines with tea polyphenols and ethylenediamine tetraacetic disodium salt was the highest，which was basically maintained at 81.22%.The antioxidant strength of the four types of fruit wine was：red heart pitaya wines with added compound color protection agent>red heart pitaya wines with single color protection agent>red heart pitaya wines>commercially available red heart pitaya wines.With the prolonged storage time，the antioxidant activity of red heart pitaya wine showed a downward trend，and the degradation of pigments had a very significant positive correlation with the size of its antioxidant activity（R2=0.9-0.998）.Compound color protection agent was added to red heart pitaya wines the agent could effectively regulate the fade of color and maintain the antioxidant capacity of red heart pitaya winess.