Abstract: A pot experiment was carried out to study the effect of 3-methyl-phenol on the productivity and root/canopy ratio in wheat-faba bean intercropping and mono-cropping at concentrations of 0 (A₀),150×10^-6 mol/kg (A₁), 300×10^-6 mol/kg (A₂) and 450×10^-6mol/kg (A ₃).Results show that in the maturity stage, yield of intercropped wheat improves by 59.26%,25.16 %,-44.33% and -74.15% compared to mono-cropping treatments of A₀,A₁,A₂ and A₃ respectively.Yield of intercropped faba bean improves by -8.79%,5.52%,13.40% and 160.38% respectively.In intercropping system,compensation for different components is an important function of yield stability.3-methyl-phenol shows greater positive economic benefit and yield harvest index under intercropping than under mono-cropping system at A₁ dose,but as the dosage improves to A₂ and A₃,3-methyl-phenol shows less negative economic effect and yield harvest under intercropping than under mono-cropping system.Root/canopy ratio of wheat and faba bean intercropping decreases at 3-methyl-phenol dose of A₁ and A₃.Compared with mono-cropping system,intercropping shows an advantage of transferring photosynthesis to above-ground biomass.