1、本研究对阿萨姆种、掸部种、越南大叶种、云南大叶种和台湾大叶种等五个国内外大叶品种的形态进行了观察和分析,并用系统分类法和模糊聚类法分析了五个品种之间的亲缘关系. 2、五个品种均属小乔木型的大叶品种.它们的花的形态,叶片内外部形态均存在程度不同的差异.3、通过系统分类和模糊聚类分析,认为以上五个品种可分为二类,其中台湾大叶种具有子房无毛等特征,归属于秃房茶系,而其它四个品种均归属于茶系.阿萨姆种、掸部种、越南大叶种和台湾大叶种与云南大叶种的相似系数分别为0.96、0.70、0.86、0.20. In this study, we observed and analyzed the morphology of five large-leaved species including Assam species, Shan species, large-leaved species from Vietnam, large-leaved species from Yunnan and large-leaved species from Taiwan. The classification and fuzzy Cluster analysis of the genetic relationship between the five varieties.2, five varieties are small arborvitae large-leaved varieties.The shape of their flowers, leaves inside and outside the shape of the existence of varying degrees of difference.3, through the system Classification and fuzzy clustering analysis, that the above five varieties can be divided into two categories, including large-leaved species of Taiwan ovary hairless and other characteristics, belonging to the bald house tea, while the other four varieties are attributed to the Department of tea. The similarity coefficients of Sam species, Shan species, Vietnam big-leaf species and Taiwan big-leaf species and Yunnan big-leaf species were 0.96,0.70,0.86,0.20.