Abstract: Four Aletai adult sheep with permanent cannula were chose, the total mixed ration (TMR) and the corn straw were normal feed every day , free drinking water. The different dry method were studied to the influence of dynamic degeneration rate in sheep rumen the various periods of duration Xinjiang small reed’s dry material, the crude protein ,the neutral detergent fiber (NDF) and the acid detergent fiber(ADF).The results showed that: ① The drying velocity is quick preservation of raw material nutrient were high, its degeneration rate is also high. Generally, natural dry is more than natural shade dry(P<0.05). ②In the early growing periods, the nutritional value of raw material is also more high, particularly the CP, the NDF and the ADF degeneration rate is quite high in the florescence and the solid time (P>0.05); ③Degradation rate of dry matter take 12 h as the turning point, The degeneration rat of crude protein arrives at 90% in four hour. Degradation rate of, the neutral detergent fiber (NDF) and the acid detergent fiber(ADF) , The increasing tendency relatively slow （P＞0.05），there was no significant difference(except heading date).

Key words: Xinjiang small reed; growing periods; drying methods; rumen; dynamic degradation