With normal regulat ions method, the digestive tube indices of Mystus macropterus such as ratio of intestine gut length to body length was 0. 531 ? 0. 006 while the ratio of stomach, intestine gut, hepatopanceras or viscera weight to body weight were 0. 014 ? 0. 006, 0. 017 ? 0. 003, 0. 0084 ? 0. 0029 and 0. 070 ? 0. 011, respectively . The regression of body weight with body length was Y= 0. 1238X2. 8388( r = 0. 9949, P < 0. 01) . The pH value of stomach, anterior intestine, middle instestine, posterior intestine and hepatopancreas were 3. 0- 3. 8, 6. 6- 7. 4, 7. 2- 8. 2 and 7. 2- 7. 9, respectively. At the same time, the activities of protease were middle instestine> anterior intestine > hepatopancreas > posterior intestine> stomach; the activities of amylase were anterior intestine> posterior intest ine> middle instestine> hepatopancreas> stomach. The crude protein of muscle and whole body were 62. 09 ? 3. 8% and 68. 28 ? 4. 6, repectively ; the crude fat were 15. 33 ? 1. 7 and 21. 87 ? 2. 9, repectively. The essential amino acids accounted for 40. 76% of total amino acids and the delicious amino acid accounted for 29. 70% of total amino acids. It was indicated that the nutritive value of Mystus macropterus is higher than that of the common carp and grass carp.