Abstract: Choose 20 letter piglets of the same breed and birth date, adopt singlefactor design 5 groups ,and 4 repeats of each group, group A(control group)、group B(antibiotics group)、group C(the 1stgroup of plant extracts additive)、group D(the 2nd group of plant extracts additive) and group E(the 3rd group of plant extracts additive).From 15 to 17 days of age , the feeding trial started and lasted 42 days.The experiment results indicate that:the growth performance (weaning weight 、average daily gain) of group B,C,D and E were higher than group A (P<0.05)，but there were no signficant difference in the growth performance from group B，C，D and E(P>0.05)，the rate of diarrhea and death of group B，C，D and E were signficant lower than control group, but were no signficant difference from group B.The results of TP，ALT and AST indicated that the results of group D and C were signficant higer than group A，B and E (P<0.05). This article provided that these three compund plant extracts additive have the function of promoting growth and decreasing the rate of death, and the experment effect is same as the antibiotics group.

Key words: plant extracts; antibiotics; feed additive; piglets