Abstract: To study the nutrition and food value of grass carp (Ctenopharyngodon idellus), we fed the fish with broad bean and common compound feed to compare and analyze the contents of collagen, Ca²⁺, amino acids and fatty acids in their muscle. The results reveal that compared with group of common compound feed, contents of collagen and Ca²⁺ in group of broad bean are (0.149±0.011)% and (0.036±0.011)%, respectively, which increase 36.7% and 154%, respectively. The total content of amino acids in groups of broad bean and common compound feed are (16.802±1.823)% and (18.444±0.850)%, respectively. The total 4 kinds of delicious amino acids account for (6.613±0.771)% in group of broad bean, which is lower than those in group of common compound feed. The content of unsaturated fatty acids in groups of broad bean and common compound feed account for 73.857% and 76.334% of total fatty acids, respectively, and monunsaturated fatty acids account for(55.598±2.403)% and (33.832±2.755)% of total fat, respectively. It shows that the contents of collagen and Ca²⁺ of grass carp fed with broad bean are higher than those fed with common compound feed, while the flavor, contents of amino acids and unsaturated fatty acids of grass carp fed with broad bean are inferior to those fed with common compound feed.