Abstract: Three Inner Mongolia sheep and three Inner Mongolia white cashmere goats （aged 1.5 years and weight about 40 kg, with a permanent rumen cannula）were used. The nylon bag method was used to comparatively study the differences of dynamic degradation laws of Caragana intermedia with rich tannin in the rumen of sheep and goats. The results showed that effective degradation rate of DM, NDF,ADF of C. intermedia in the rumen of sheep were all higher than that in rumen of goats. And the effective degradation rate of NDF and ADF in sheep were significantly higher than that in goats （P〈0.01）. The instant degradable fraction （a）of DM, NDF and ADF in goats showed a increasing tend compared than that in sheep. While slowly degradable fraction （b） and potentially degradable fraction （a＋b）of DM ,NDF and ADF of C. intermedia in sheep were higher than that in goats （P 〉 0.05）. The degradable speed （Ka）of slowly degradable fraction of NDF and ADF in sheep was significantly higher than that in goats（P〈O.05 ）. The degradation rate of DM, NDF and ADF of C. intermedia in sheep and goats were different and the digestibility of crude fiber of C. intermedia in sheep was betteer than that in goats. This might be related to different rumen microbial flora, the amount of rumen pool and digesta retention time in sheep and goats. And the results also showed that some microbes that could make better use of tannic feed might exist in the rumen of goats.