一前言云南大叶种茶树是我国优良的茶树品种之一。这种茶树的产品具有优异的品质,在国际市场上享有崇高的声誉。它不懂在色、香、味等品质上有着独特的风格,而且其主要化学成分的含量也超过一般品种。据中国茶叶分级研究小组1954年分析结果:滇红水浸出物含量为45.01—47.93%,单宁为12.02—15.70%,茶素为3.66—4.16%;而普通红茶的水浸出物平均含量约为40%,单宁含量为8.0—12.0%,茶素为2.29—2.31%。同时,云南大叶种的生长期长,芽叶大,育芽能力强,这些都 A preface Yunnan big leaf tea is one of the fine varieties of tea tree in our country. This tea tree products have excellent quality, enjoy a high reputation in the international market. It does not understand in the color, smell, taste and other quality has a unique style, but also its main chemical composition than the average variety. According to the analysis result of China Tea Grading Research Group in 1954, the content of Dianhong water extract is 45.01-47.93%, the tannin is 12.02-15.70% and the content of catechin is 3.66-4.16%; while the average content of water extract of common black tea is about 40%, tannin content 8.0-12.0%, and catechin 2.29-2.31%. At the same time, Yunnan big leaf species grow long, large buds, bud ability, these are