Abstract: To investigate the effects of adding different doses of Chinese herbal feed additives into diets on performance and immune organ index of broilers,288 one day-old AA broiler （healthy and close weight） were selected and divided into four groups according to their weight,six in each group and 12 chickens in each replicate.They were fed with different diets： control group,diets not supplemented Chinese herbal feed additive;group Ⅰ,diets supplemented Chinese herbal feed additive at a proportion of 0.5%;group Ⅱ,diets supplemented Chinese herbal feed additive at a proportion of 1%;and group Ⅲ,diets supplemented Chinese herbal feed additive at a proportion of 2%.After a feeding period of 42 d,feed intake,daily gain,feed conversion ratio,spleen index and thymus index were determined.The results showed that supplementing the Chinese herbal feed additive into broiler′s diets can greatly improve the growth performance and immune organ index,and the best effects are achieved by supplementing 1% of compound Chinese herbal.