120 Duroc×Landrace×Yorkshire growing-finishing pigs were divided into three groups randomly in this single factor test trial.The control group Ⅰwas fed with basal diet and the control groupⅡwas fed with basal diet plus antibiotics,and the experimental group was fed with basal diet added SOPIS（Soybean Oligosaccharides,Peptides,Isoflavones and Saponins）.The result of feeding trial indicated that compared with control groupⅠSOPIS remarkably improved daily gain,feed/gain as well as diarrhea rate.Furthermore,three indexes of the experimental group was the same as control groupⅡ.According to the results obtained from this study we can draw the conclusion as follows: adding SOPIS in growing-finishing pig diet can completely substitute antibiotics feed additive.