THIS experiment was performed to study on the effect of the growth and health of animal. Weight gain, feed efficiency and growth condition of internal organs of broiler and its resulting economical utility were investigated in this experiment of feeding velvet to broiler chicken. Three hundred chicken were applied to this experiment the treatment plots were divided 5 groups; T₁ (1cc of 0.375% velvet solution per chick), T₂(2cc), T₃(5cc), T₄(20cc), and the control (no velvet solution). The results obtained were as follows. 1. The plot which was treated with velet showed much more weight gain than the control (P$lt;0.01), and feeding velvet caused a useful effect en the feed efficiency and growth of internal organs. 2. Weight gain was high in the plot of T3, and T2, feed efficiency was high in order T1, T2 and T3. The plot of T1 was more economical than those of T3 and T2, so the use of adequate level of velvet was from 1 to 5cc. 3. It seemed that velvet improved the function of secretion of testosteron and sperm formation, because the growth testicle was promoted at the plots of T2, T1 and T3. As the velvet had a tendency of inhibition from growing thyroid at the plots of T3, T2 and T1, the metabolism was controlled by it, and the accumulation of nutritive substance was promoted The growth of the organs showed little difference in each treatment.