Abstract: Kidney bean is widely cultivated in Xinzhou area,so the research on kidney bean resources is particularly important for regional agricultural economic development.The present study was to investigate the extraction and stability of pigment from four different red kidney bean varieties.The effect of different metal ions,temperature,redox agents and common food additives on the stability of pigment in kidney bean were studied.The results showed that the content of pigment in black seed coat kidney bean was higher than that in red seed coat.The results of antioxidant assay demonstrated that kidney beans had excellent DPPH free radical scavenging ability in the order of D_05-01>96-97>D_05-09>D_05-10.The pigment from four kinds of kidney beans all had strong stability under the conditions of heat,sodium,potassium,and commonly used food additives,while iron ions had certain influence on its stability.The pigment from different kidney beans varieties had different response to oxidants.In a word,kidney bean has higher content of pigment with excellent antioxidant and stability,which is expected to become the natural source for food pigment additives.