The study was conducted to test the effectiveness of early castration on weight gain of male rabbits. Twenty male rabbits (initial body weight 0.942-1.283 kg) were used in this experiment. They came from ten litters (two per litter) and were assigned into two groups: one was control group, and the other was test group. These two groups formed a comparison group. The rabbits of the test group were early castrated. Other treatments of the two groups were the same. T-test showed that castration resulted in increasing of average body weight and improving of food efficiency.