Abstract: Twenty-nine Cerasus humilis superior lines resources fruits from Inner Mongolia were selected as experimental materials. The difference analysis, correlation analysis and cluster analysis were used to compare the difference of proanthocyanidin content and antioxidant activity of Cerasus humilis fruit and the correlation between them, and cluster evaluation was carried out, in order to provide reference for breeding and further application of Cerasus humilis resources in Inner Mongolia.The results showed that, proanthocyanidins content and antioxidant activities of fruits of different Cerasus humilis resource were significantly different.The total reducing power was an important indicator to reflect the antioxidant activity of Cerasus humilis fruit.Cerasus humilis with red and orange flesh had higher overall antioxidant activity than those with light red flesh.As the acidity of Cerasus humilis fruit increased, the overall antioxidant capacity showed a decreasing trend.Nine high proanthocyanidins content and antioxidant activity Cerasus humilis resources were screened using K-means integrated clustering as MY4,MY5,MY8,MY11,MY14,MY16,MY17,MY36,MY37.The Cerasus humilis resources screened by different clustering analyses can be used for in-depth follow-up fruit quality research, resource research and variety selection and breeding.