In order to evaluate the additive maize-bean intercropping and control of weeds in Zanjan conditions, a field study was conducted in a spilt plot with randomized complete block design in three replications at Research Farm of Zanjan University in 2010. Main plots were the different patterns of additive intercropping systems in 6 levels included of sowing 20, 40, 60 and 80% of common bean optimum density + 100% of maize optimum density and monoculture of the crops and sub-plots were control and non-control of weeds. Density and biomass of weeds, yield and yield components of two crops was sampled. The results showed that the most of weeds control was obtained in 80% bean+100% and the highest and lowest yield of maize under non-control of weeds conditions were observed in 60% bean + 100% maize and monoculture treatments, respectively. According to the all of indicators, intercropping had advantages compared to the monoculture of the crops. The intercropping of 80% bean + 100% maize had the highest advantage based on Land Equivalent Ratio (LER), Actual Yield Loss or Gain (AYL) and Intercropping Advantage (IA) but the highest advantage was gained in the treatment of 60% bean + 100% maize by Relative Value Total (RVT) indicator and the intercropping of 40% bean + 100% maize had the highest value as used of Relative Crowding Coefficient (RCC).

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