Biochemical composition and diversity analysis of 42 Wuyi Mingcong tea germplasms from Wuyi mountain tea area. The results showed that the biochemical diversity and variation were high in Wuyi Mountain tea germplasms. The average diversity index and coefficient of variation were 2.06 and 22.02 %, respectively. In principal component analy-sis, the first three principal components represented 89.02 % of the biochemical diversity. Based on the biochemical data, 42 Wuyi Mingcong were clustered into 3 groups. In addition to the caffeine content, other biochemical components exist significant difference of 3 groups. Most of the tea germplasms in the first and the second group suited to be processed Oolong tea. Most of the tea germplasms in the third group suited to be processed green tea. A set of special germplasms on some biochemical composition were selected.