Abstract: The experiment was conducted to study the effect of the Chinese herbal medicine against coccidian on the serum index of AA broilers. 720 1-day-old healthy AA broiler chickens were randomly divided into 6 treatments. Group 1 to 5 (the trail groups) were fed with 4% Chinese herbal medicine, 0.8% Chinese herbal medicine, 0.4% Chinese herbal medicine and 0.5 mg/kg diclazuril, 60 mg/kg salinomycin, while the group 6 (the control group) was fed with the basal diet. The results showed that the AKP activities in blood of the 3^rd and the 4^th group were significantly higher than those of the control group (P＜0.05), the ACP activities, the LPL activities, Ca and P contents were no significant difference between the control group and the trail groups (P＞0.05). The LPP activities of the 1 to 4 groups were significantly higher than those of the control group (P＜0.05 or P＜0.01). The TC contents of the 1 to 3 groups were significantly lower than those of the control group, the 4^th group and the 5^th group (P＜0.05). The BUN contents of the 2^nd group and the 3^rd group were extremely significantly lower than those of the 4^th group and the 5^th group (P＜0.01), while the 5^th group was significantly higher than those of the control group (P＜0.05). The GOT activities of the 1 to 4 groups were significantly higher than those of the control group (P＜0.05 or P＜0.01). The GOP activities were no significant difference between the control group and the trail groups (P＞0.05). The TAA contents in blood of the 1 to 3 groups were significantly lower than those of the 4^th group, the 5^th group and the control group (P＜0.05). 

Key words: Chinese herbal medicine against coccidian; broilers; serum index