The ultrasonic assisted extraction technology of apricot pulp polyphenol was studied.The optimal conditions were determined by mono-factor experiment and response surface analysis.The antioxidant activity of apricot pulp polyphenol was studied by using reducing power and clearance ability for DPPH?.The result indicated that the optimum extracting conditions of apricot pulp polyphenol were as follows: the ratio of solid to liquid 1∶ 12,concentration of ethanol 71%,the ultrasonic power 364w and the extraction time 17 min.under the above extracting conditions,the extraction rate of apricot pulp polyphenol was 9.39%.The influence effect of four factors to the extraction rate of apricot pulp polyphenol were ultrasonic power > liquid ratio > concentration of ethanol > ultrasonic time.The apricot pulp polyphenol had strong antioxidative activity.However,its antioxidative activity was lower than Vc in the same concentrations.