The effect on growth rate and fat metabolism in grass carp fed with vegetable,green fodder, formulate diet and adding vitamine B_6, methionine, linoleic acid were studied. Theresults indicated that there was a significant difference between feeding green fodder and feedingformulate diet (P<0.01) The fat contents in abdominal cavity and liver, the levels of triglyceridae and cholesterol inserum of fish fed with formulate diet were the highest, but the protein contents in liver of fish fedwith formulate diet was the lowest of three meals. The tests of feeding formulate diet added with vitamine B_6, methionine and linoleic acid il-lustrated that the contents of crude fat in liver and abdominal cavity of fish fed withsupplemental vitamine B_6, and green fodder were lowest and that fed with formulate diet werehighest. The growth rate in fish fed with 70% green fodder were fast and with the formulate dietwere slow.