In order to study the effect of astragalus polysaccharide on growth performance and nutrient di-gestibility in weaned piglets and immune function, 28 day old weaned, weight (12 ±1.04) kg three healthy cross-bred 48 piglets were randomly divided into 4 groups, with 4 replicates, each with 3 pigs. The control group was fed basal diet, 3 experimental groups were fed with 0.5 g/kg, 1 g/kg, 2 g/kg of astragalus polysaccharide in the basic diet. Test period was 28 d. The results show that, compared with the control group, daily intake of 0.5 g/kg astragalus polysaccharide group, 1 g/kg astragalus polysaccharide group, 2 g/kg astragalus polysaccharide group were increased by 0.23% (P>0.05), 6.99% (P<0.05) and 11.62% (P<0.05); the ratio of feed, 0.5 g/kg astragalus polysaccharide group decreased 0.59%(P>0.05), 1 g/kg astragalus polysaccharide group, 2 g/kg astragalus polysaccharide group were increased by 10.65% (P<0.05) and 14.79%(P<0.05);the frequency of diarrhea, 0.5 g/kg astragalus polysaccharide group, 1 g/kg astragalus polysaccharide group, 2 g/kg astragalus polysaccharide group were reduced to 0.05 percentage points(P>0.05), 0.06 percentage points (P>0.05), 0.25 percentage points(P<0.05). Interleukin-2, 0.5 g/kg astragalus polysaccharide group decreased 3.58%(P>0.05), 1 g/kg astragalus polysaccha-ride group, 2 g/kg astragalus polysaccharide group were increased by 41.69%(P>0.05) and 85.06%(P<0.05); in-terferon alpha, 0.5 g/kg astragalus polysaccharide group, 1 g/kg astragalus polysaccharide group, 2 g/kg astra-galus polysaccharide group increased 0.26%(P>0.05), 3.93%(P>0.05), 10.78%(P<0.05); IgG, 0.5 g/kg astra-galus polysaccharide group, 1 g/kg astragalus polysaccharide group were increased by 4.51%(P>0.05), 1.25%(P<0.05), 2 g/kg astragalus polysaccharide group decreased 3.22%(P>0.05). The other indexes were not signif-icant (P>0.05). Considering, in weaned piglets supplemented with 1 g/kg astragalus polysaccharide with good effect.%为研究黄芪多糖对断奶仔猪生长性能、营养物质消化率和免疫功能的影响，选择28日龄断奶、体重（12±1.04） kg的健康杜长大三元杂种仔猪48头，按体重随机分为4组，每组4个重复，每个重复3头猪。对照组饲喂基础饲粮，3个试验组分别饲喂在基础饲粮中添加0.5 g/kg、1 g/kg、2 g/kg黄芪多糖的饲粮。试验期28 d。结果表明，与对照组相比，日采食量0.5 g/kg黄芪多糖组、1 g/kg黄芪多糖组、2 g/kg黄芪多糖组分别提高0.23%（P＞0.05）、6.99%（P＜0.05）、11.62%（P＜0.05）；料重比，0.5 g/kg黄芪多糖组降低0.59%（P＞0.05），1 g/kg黄芪多糖组、2 g/kg黄芪多糖组分别提高10.65%（P＜0.05）、14.79%（P＜0.05）；腹泻频率，0.5 g/kg黄芪多糖组、1 g/kg黄芪多糖组、2 g/kg黄芪多糖组分别降低0.05个百分点（P＞0.05）、0.06个百分点（P＞0.05）、0.25个百分点（P＜0.05）。白介素-2，0.5 g/kg黄芪多糖组降低3.58%（P＞0.05），1 g/kg黄芪多糖组、2 g/kg黄芪多糖组分别提高41.69%（P＞0.05）、85.06%（P＜0.05）；干扰素-α，0.5 g/kg黄芪多糖组、1 g/kg黄芪多糖组、2 g/kg黄芪多糖组分别提高0.26%（P＞0.05）、3.93%（P＞0.05）、10.78%（P＜0.05）；IgG，0.5 g/kg黄芪多糖组、1 g/kg黄芪多糖组分别提高4.51%（P＞0.05）、1.25%（P＜0.05），2 g/kg黄芪多糖组降低3.22%（P＞0.05）。其余指标各组差异不显著（P＞0.05）。综合考虑，在断奶仔猪饲粮中添加1 g/kg黄芪多糖饲喂效果为好。
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