In order to study the capability of utilizing carbohydrate in the diet and the effects of different carbohydrate diets on allogynogenetic crucian carp,artificial purified feed with normal(including 35% carbohydrate)and high(including 50% carbohydrate)level carbohydrate were applied.168 individuals of allogynogenetic crucian carp［(35.60±1.11) g］ were divided into the two carbohydrate level groups,and each group has three replicates which were cultured in aquarium with automatic temperature control culturing system with recycling water for 10 weeks.After that,indicators of fish growth,plasma biochemical indices and immune indicators were measured.The results showed the specific growth rate,weight gain rate were significantly lower than normal carbohydrate group(35%CHO),but no significant difference on feeding rate,feed conversion rates,muscle composition,hepatosomatic indices,gonad indices and fullness coefficient.The total plasma protein,plasma triglycerides,total cholesterol,blood glucose and hepatic glycogen did not significantly change(P>0.05).The hepatic MDA content of 50%CHO group was significantly(P<0.05)higher,while the AST was significantly(P<0.05)lower.The hepatic SOD,T-AOC,ALT,and AKP had no significant(P>0.05)differences between 35%CHO group and 50%CHO group.The hepatic ultrastructure in allogynogenetic crucian carp have been investigated using transmission electron microscopy.The result shows high carbohydrate dietary induced sedimentation of glucose and fat in hepatic cell,and structure damages are observed as well.Overall,50% carbohydrate dietary has impacts on growth,hepatic immunity function and induces structure damages,although allogynogenetic crucian carp has greater tolerance for it.