Abstract: 【Objective】To study the correlations between antioxidations, contents of total phenolics and anthocyanin in 127 accessions of black soybean.【Method】 A t-test, a fast clustering procedure and a correlation coefficient analysis were used for experimentation.【Result】The ranges of total antioxidant capacity (TAC), total phenolics and anthocyanin contents in 127 black soybean accessions were 0.44-3.56 mmol·g-1, 7.05-74.82mg·g-1 and 0.22-1.87mg·g-1, respectively, displaying significant genotype differences. The big differences in TAC, total phenolics and anthocyanin contents existed among various types of accessions from geographical regions. The differences between accessions from black and yellow soybeans, Spring and Autumn, Summer and Autumn, Dongbeichun and Nanfangchun, Dongbeichun and Nanfangxia, Beifangchun and Nanfangchun, Beifangchun and Nanfangxia were significant at 0.01 or 0.05 levels respectively. The general tendency was that the TAC, total phenolics and anthocyanin contents of Beifangchun accessions were higher than those of Dongbeichun ones, those of Nanfangchun accessions were the least. 127 black soybean accessions could be clustered into 6 clusters which consist of 3, 24, 20, 31, 37 and 12 accessions, respectively. Most significant (P<0.01) correlations existed respectively between the TAC and total phenolics content, TAC and anthocyanin content of black soybean.【Conclusion】The results showed total phenolics and anthocyanin in black soybean seed coat were the important antioxidation substances.

Key words: Black soybean seed coat, Antioxidation, Total phenolics content, Anthocyanin content, Correlation