The contents of functional ingredient in Hainan I. latifolia extract include proteins,amino acids,polyphenols,tea polysaccharide was measured and compared. The result showed that Hainan I. latifolia is a type of tea which had higher polysaccharides than other tea. In addition,the tea extract made from new leaves had more polyphenols,and amino acid than extract made from old leaves,while the content of polysaccharide in old leaves was higher than the new leaves. Protein content of these two kinds of tea were...