DPPH and ABTS antioxidant experiments were used to evaluate the antioxidant activity of single and mixed agricultural product extract （mulberry， blueberry and sweet potato）. The experimental results were plotted according to different proportions of different agricultural products， and the differences in antioxidant interactions caused by the mixture of extracts and proportions of different agricultural products were analyzed by isoradiation analysis method. Results showed that in DPPH antioxidant scavenging experiment， the optimal antioxidant capacity product was blueberry extract followed by the mulberry extract and the sweet potato extract. And in the same model， the mulberry extract and sweet potato extract were mixed at a ratio of 15∶5 to achieve the optimal antioxidant capacity. In the ABTS antioxidant scavenging experiment， the best antioxidant capacity product was mulberry extract followed by the blueberry extract and the sweet potato extract. And the mulberry extract and sweet potato extract were mixed at a ratio of 9∶11 to achieve the best antioxidant capacity. Among the combination of agricultural products， the combination of lipophilic-hydrophilic extracts showed the highest synergistic antioxidant effects.