This experiment was conducted to study the effects of konjac mannose oligosaccharide supplemental level on growth performance, fur quality, slaughter performance and meat quality of growing Rex rabbits. One hundred and twenty weanling Rex rabbits with an average body weight of (0.84±0.07) kg were randomly assigned to 5 groups with 24 replicates in each group and each replicate contained 1 rabbit. Rabbits in groupⅠ (control group) were fed a basal diet, while the rabbits in groups Ⅱ to Ⅴ (experimental groups) were fed experimental diets supplemented with 50, 100, 150 and 200 mg/kg konjac mannose oligosaccharide on the basis of the basal diet, respectively. There was a pretrial period of 7 days followed by an experimental period of 60 days. The results showed as follows:1) konjac mannose oligosaccharide supplemental level had significant influences on average daily gain and feed/gain (P<0.05). The average daily gain of group Ⅲ was the highest and significantly higher than that of control group (P<0.05). The feed/gain of group Ⅲ was the lowest and significantly lower than that of control group (P<0.05). The diarrhea rate and mortality in all experimental groups were lower than those in control group, but no significant differences were found among them (P>0.05). 2) Konjac mannose oligosaccharide supplemental level had no significant influences on wool density, wool length and fur weight (P>0.05), but had a significant influence on fur area (P<0.05).The fur area in group Ⅲ was significantly bigger than that in control group (P<0.05), while there were no significant differences among all experimental groups (P>0.05). 3)The all eviscerated slaughter rate and half eviscerated slaughter rate in all experimental groups were higher than those in control group, but no significant differences were found among them (P>0.05). 4) Konjac mannose oligosaccharide supplemental level had no significant influences on pH at 45 min and 24 h after slaughter, shear force, cooking loss and L^* value, a^* value, b^* value of Rex rabbits meat (P>0.05). Considering all indices of this experiment, the appropriate konjac mannose oligosaccharide supplemental level in the diet of growing Rex rabbits is 100 mg/kg.