Abstract:The amino acids in protein of quinoa bran were detected by Automatic amino acid analyzer.The content of Asp、Glu、Leu、Arg was higher，more than 50 mg/g pro，while the content of Cys and Met was relatively lower，and the lowest were 16.72 mg/g pro and 17.43 mg/g pro，respectively.There was no significant difference in amino acid composition between total protein and albumin of quinoa bran.Prolamin was rich in hydrophobic amino acids，especially Pro，but Tyr was relatively deficient.Globulin contained higher lysine，while glutelin contained lower Cys.Lys was the restrictive amino acid for total protein，albumin and glutelin of quinoa bran，Leu for globulin，and the restrictive amino acids of prolamin were Ile，Leu and Lys，while lys was the first limiting amino acid.According to the FAO/WHO recommended score model of essential amino acids for human body aged 0.5 years and over 18 years，the amino acid scores were 63，68，73，83，66 and 80，86，93，93，82，respectively.The ratio coefficient of amino acid（RC）and score of RC（SRC）of total protein and albumin were similar to egg protein，with the close degree of amino acid composition 0.99，which were better than globulin，prolamin，glutenin and soy protein isolate.Globulin was the same as glutenin，slightly better than soy protein isolate，and the nutritional value of prolamin was the lowest.