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The major monomer and oligomer of proanthocyanidins from the petals, seeds, fruits or pericarps of 11 plants were detected, and the difference of proanthocyanidin contents were analyzed in a variety of plants in this study. The catechin(C), epicatechin(EC), gallic acid(GA), procyanidin B2 (PCB2), procyanidin B4(PCB4), procyanidin A2(PCA2) of the 11 plants were extracted by 85% ethanol solution under ultrasonic, purified by Oasis PRiME HLB solid phase extraction column and separated by high performance liquid chromatography(HPLC). The result showed that monomers or oligomers of proanthocyanidins could be detected in 11 plants under the selected chromatographic conditions, and the content was mainly proanthocyanidin oligomers(OPC). Among them, the content of proanthocyanidins in grape seeds was the highest and the types were the most. Six proanthocyanidin monomers and oligomers were all detected in grape seeds. Two monomers, C and GA, and three oligomers, PCB2, PCB4 and PCA2, were detected in rose petals and peanut seed coats, respectively. In blueberry, walnut kernel, lycium ruthenicum murray and purple cabbage, except one proanthocyanidin monomer was detected, three kinds of proanthocyanidin oligomers were detected in blueberry and walnut kernel, while only PCB2 and PCB4 were detected in lycium ruthenicum murray and purple cabbage. The pericarp of red potato and purple potato only had OPCs; and the types of proanthocyanidin monomers and oligomers in red pepper and pericarps of dragon fruit were few and the content was low. In addition, the seed and pericarp of grape, peanut kernel and its seed coat were different parts of the same plant, and the types and content of proanthocyanidins were different. The types and contents of proanthocyanidins in different plants were different. The types and contents of proanthocyanidins in different parts of the same plant were also different. The differences of distribution, composition and concentration of proanthocyanidins in different plants lay a foundation for the study of structure-activity relationship and its development and utilization. [ABSTRACT FROM AUTHOR]