采摘茶树在年生长周期中,新梢一般生育四次。每轮新梢从萌动展叶至出现对夹叶而趋于成熟的变化过程,人们按所采芽叶的老嫩程度分为不同的级别,我所把鲜叶分为五级。不同级别的鲜叶由于老嫩的差别,內含成分高低不一,所制成茶品质自然有所不同,就是同级的鲜叶,因茶季不同,芽叶的有效成分差別很大,成茶品质差距也很显著。本文对不同茶季原料的品质变化暂不进行探讨,仅对鲜叶的级 Pick tea tree in the annual growth cycle, the new shoots generally four births. Each round of shoots from the sprouting leaves to appear to the leaves and tend to mature process of change, people according to the degree of tenderness of the sprouted leaves are divided into different levels, I put the fresh leaves is divided into five levels. Different grades of fresh leaves because of the difference between the old and young, containing different levels of ingredients, made of naturally different quality of the tea is the same level of fresh leaves, because of the different tea season, the effective content of bud leaves vary greatly, into Tea quality gap is also significant. In this paper, the quality of the raw materials in different tea season will not be discussed temporarily, only the grade of fresh leaves