Abstract: The effect of different organic materials on respiration intensity of the M. hupehensis Rehd. root system (absorbing root,growing root and brown root) was studied. The results showed that: In summer,the respiration intensity of root with chicken manure treatment was higher than sheep manure and the lowest was peanut vine treatment,on the contrary, the sheep manure treatment were higher than chicken manure in autumn.The respiration intensity of whole root system of the chicken manure,sheep manure and peanut vine increased by 56%,31% and 25 % compared with CK in summer, respectively; and sheep manure was higher than chicken manure by 19 % in autumn. The respiration intensity of absorbing root,growing root and brown root was significantly different. The absorbing root and growing root were 2 to 3 and 1.5 to 1.9 times that of brown root in summer, and 2 to 2.4 and 1.3 to 1.7 times in autumn, respectively. The ratios of respective respiration amount of white roots and brown roots in the whole root system vary with the changes of seasons. The respiration of white roots exceeded 50% of the total in summer, while the brown roots occupied 68% to 80% of total root system in autumn.