Abstract:In order to research the types and contents of amino acids in Hanzhong Congou black tea， and evalu－ ate its nutrition， all types and contents of amino acids in different seasons of Hanzhong Congou black tea were analyzed and compared by using automatic amino acid analyzer.The results showed that the amino acids of Hanzhong Congou black tea were various and high levels.The 32 kinds of amino acids were detected， the aver－ age content was 32.399 mg/g. The content of theanine was more than 50 %. Types of essential amino acids were complete（tryptophan could not be checked out because of hydrolysis）. The contents were high levels， the aver－ age content was 2.595 mg/g， the first limiting amino acids mainly were cystine + methionine. Taste amino acids were all checked out and the content were high the average content was 24.931 mg/g. The contents of amino acid of black tea were diversity in different season， total amino acids sequence were： summer > spring > autumn.The contents of total amino acids， essential amino acids， taste amino acids of summer are highest， so summer black tea's quality and nutritional value were the best. This might be related to high temperature， longer sunshine and rich rainfall in summer， promoting the process of nitrogen metabolism about the tea trees .To sum up， the amino acids of Hanzhong black tea have the very high nutritional value.