This experiment was conducted to investigate the dynamic change and rumen degradation characteristics of Caragana korshinskii nutrients in different growth periods in Hohhot, Inner Mongolia. Twigs of Caragana korshinskii were mowed in budding, flowering and fructicative periods, respectively, and the nutrients were analyzed after determination of initial moisture and then drying in the oven at 65 ℃. Three sheep fixed with permanent rumen fistulas were selected and the rumen nylon bag technique was used to study the rumen degradation characteristics of Caragana korshinskii nutrients in different growth periods. The results showed as followed:1) the contents of dry matter (DM) and crude protein (CP) of Caragana korshinskii in flowering and fructicative periods were significantly higher than those in budding period (P＜0.05); there were no significant differences in the contents of ether extract, nitrogen free extract and organic matter (OM) among budding, flowering and fructicative periods (P＞0.05); the crude ash content in fructicative period was significantly higher than that in budding and flowering periods (P＜0.05); the neutral detergent fiber (NDF) content in budding and flowering periods was significantly increased compared with that in fructicative period, however, the acid detergent fiber (ADF) content was significantly decreased (P＜0.05); the lignin content was increased with the extend of growth period, and the lignin content in the flowering and fructicative periods was significantly increased compared with that in budding period (P＜0.05); the Ca content was significantly increased (P<0.05) but the P content was significantly decreased (P<0.05) with the extend of growth period. 2) Rumen DM disappearance rate at 72 h and effective degradation rate were decreased gradually with the extend of growth period, and effective degradation rate in budding period was significantly higher than that in flowering and fructicative periods (P＜0.05); there were no significant effects for growth period on rumen CP disappearance rate at 72 h (P＞0.05), however, effective degradation rate in budding period was significantly higher than that in flowering and fructicative periods (P＜0.05); with the extend of growth period, rumen disappearance rate at 72 h and effective degradation rate of OM and NDF were decreased significantly (P＜0.05); there were no significant differences in rumen disappearance rate at 72 h and effective degradation rate of ADF between flowering and fructicative periods (P＞0.05), but they were all significantly lower than those in budding period (P＜0.05). It is concluded that Caragana korshinskii has a higher utilization rate in flowering period and it is appropriate for mowing in this period considering nutritive components, grass DM production and rumen degradation characteristics of Caragana korshinskii in different growth periods.