Abstract: 【OBJECTIVE】The purpose of this study is to examine the effect of varying interspecific root interactions on the dry weight of shoot/root biomass and N-content in a split-pot arrangement experiment. 【METHOD】At first, we vary the ability of root interactions artificially through different barrier treatment (plastic, mesh, and no barrier). Then, choose three sorts of cereals (barley, wheat and maize) with various abilities to compete the soil nitrogen intercropping with faba bean. 【RESULTS】Firstly, there is no significant influence on faba bean shoot and root biomass dry weight, whatever different barrier treatment and various sorts of cereals intercropping systems. Only is the shoot biomass of faba bean in no-barrier significantly more than the treatment of nesh-barrier. Secondly, the biomass of maize and barley is significantly higher than one of wheat, about15.3% and 16.5%, respectively. The root biomass of maize is much more than the barley, approximately 30.5%. So do barley and wheat, about 50.8%. The varying barriers have significant effect on the shoot and root biomass in the same intercropping system. Thirdly, the N-content of barley is significantly higher than the maize and wheat, about16.5% and 19.7%, respectively. The faba bean N-content intercropping with maize is much more than the one with wheat and barley, about 11.2%和5.6% , respectively. 【CONCLUSION】The biomass of faba bean is not affected significantly by intercropping with cereals, whereas the barley/faba bean intercropping system mostly makes use of the N-nutrition, and the N-nutrition of maize significantly profits from intercropping with faba bean. Besides, the no-barrier treatment benefits in N-accumulation.