Abstract: The branches of Caragana korshinskii harvested at rejuvenation were crushed into powder which can be used as coarse fodder of herbivores. The Caragana powder is very nutritious but hard. And it contains anti-nutritional factors like tannin. These characteristics lead to poor palatability, low intake and low utilization rate in herbivores. The effects of expansion process on contents of tannin, crude protein, crude fat, crude fiber, nitrogen free extract and crude ash in Caragana korshinskii harvested at different times. The tannin content decreased from 2.01%-2.96% to 0.18%-0.27%. The crude fiber content decreased from 33.96%-39.12% to 28.23%-33.95%. The nitrogen free extract content increased from 39.42%-42.91% to 45.33%-48.42%. All differenc, es were at a significant level. Therefore, the expansion process can improve nutrient value of Caragtma korshinskii greatly.