Abstract: To investigate effects of dietary replacement fishmeal protein with Spirulina platensis powder protein on feed intake, growth performance, feed utilization and protein deposition in juvenile gibel carp (Carassis auratus gibelio var. CAS ), six isonitrogenous, isolipidic and isoenergitic diets were formulated to contain graded levels of fishmeal protein replacement by Spirulina platensis. (0, 20%, 40%, 60%, 80% and 100% respectively) for a 60-day trial. Triplicates of 20 fish initial body weight of (3.20.5) g were fed to apparent satiation with six experiment diets., The water temperature was (283)℃ during the experiment. With the increased proportion of Spirulina platensis in diets, feeding rate (FR) was significantly elevated while feed efficiency (FE) was significantly decreased. There was no significant difference in specific growth rate (SGR) between fishmeal group (FM) and 20% of Spirulina platensis replacement (SP20) (P0.05), of which was significantly higher in fishmeal group than other groups (P0.05). Meanwhile, no significant differences were found in protein retention efficiency (PRE) between FM, SP20, SP60 (P0.05), while other groups were significantly lower than that of the FM group (P0.05). The condition factor (CF) of FM group was significantly higher than other groups (P0.05). The carcass protein of SP100 group was significantly lower than other group (P0.05). A trend was observed in carcass fat, which the content of fat decreased from FM to SP40 group then increased from SP40 to SP100. The carcass ash of fish was significantly higher in SP20, SP40, SP60 than FM group (P0.05). There was no significant difference among all treatments in intestinal digestive enzyme (trypsin, lipase, -amylase) (P0.05). Apparent digestibility coefficients of dry matter significantly increased, while apparent digestibility coefficients of crude protein significantly decreased with the increased content of Spirulina platensis (P0.05). The lowest apparent digestibility coefficient of total phosphorus was at SP20, and the highest one was at SP100. According to the variation of SGR and PER among all treatments, the optimum proportion of Spirulina platensis replacement dietary fishmeal protein was 20% while fishmeal as the sole protein source in the diet (the content of fishmeal in diet was about 50%).