The genetic relationship among Korean native tea tree germplasm based on chemical constituets is required to increase the efficiency of breeding. This work was done to classify 63 native tea tree lines by 7 chemical constituents which were analyzed by NIR system. The principal component and cluster analyses revealed 10 groups. The first group included 3lines that had the traits with lower total nitrogen contents, but higher vitamin C of leaves. The second group included 6 lines having lower free amino acid and theanine contents, but higher catechin contents of leaves. The third group included 2 lines having lower contents of free amino acid and theanine. the 5th group included 67%(42 lines) showing medium values of 7 chemical constituents. The 6th group included 2 lines that had higher caffeine and catechin contents, but lower fiber and vitamin C contents. The 7th group included higher caffeine and catechin contents, but lower theanine and vitamin C contents. The 8th group included lower catechin contents, but higher free amino acid, thenine and vitamin C contents. The 9th group included 2 lines showing lower caffeine and catechin contents, but higher theanine and fiber, and the last group included 1 lines that had lower catechin, but higher total nitrogen, free amino acid and thanine contents of leaves. The free amino acid contents that are the most important in flavor evaluation of green tea quality highly positively correlated with the contents of total nitrogen (0.848**), theanine(0.927**), but negatively with the contents of catechin (-0.501**) and fiber(-0.574**), respectively.
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