Abstract: Objective: Protein of seventeen aimino acids and seven inorganic elemets in North - east water chestnut were assayed Methods:AAS and amino acid analyser were used.Results:Proteins of fruit and of flesh, were accounted for 11.90%、18.92% respectively in sample (Ⅰ)、(Ⅱ).Eight essential amino acids and seven trace elements were found.The amino acid scores were ideal.It was observed that the contents of essential trace elements Fe、Zn、Cu、Mn、Ca and Pwere rich，Conclusion:This paper provided a scientific basis for evaluating the quality of north east water chestnut.

Key words: North east water chestnut Amino acid Trace elements