The effects of the integrated rice-duck farming system(IRDFS) was studied with a control treatment of conventional rice monoculture system(CRMS). The experimental data showed that the everyday activities of ducks in IRDFS could affect the growth of rice. Compared with the CRMS, the height, leaf area index and biomass of rice in IRDFS decreased and there was a significant difference during the tillering and heading stage. But root/shoot ratio, root activity were higher in IRDFS than those in CRMS because of stimulation of ducks in the paddy field. There were significant differences for root/shoot ratio during the heading stage and for root activity during the tillering stage. Total root length of rice showed no signficant change trend. There was not a significant difference in root surface area of rice by comparing with the control treatment.