[Objective] The research aimed to evaluated the amino acids content of the Nostoc commune in Qinghai plateau comprehensively.[Method] By application of the principal component analysis and the statistic software SPSS,the amino acids content of the N.commune in Qinghai plateau was studied.[Result] The results showed that the quality of amino acids was the first in Hainan prefecture,the second in Huangnan prefecture,and the last in Haixi prefecture.[Conclusion] The study will provide the scientific references...