Abstract: Effects of FA and mixed surfactants on the absorption of B and Mn in cabbage and peanut leaf were studied. Mixed surfactants could decrease surface tension of the foliar fertilizer solution. It improved B and Mn uptake in cabbage and peanut leaf. Effect of FA on surface tension of the solution is not obviously. It also improved B and Mn uptake in cabbage and peanut leaf as chelating reagent. Composite systems of surfactants and FA could produce synergism, which could decrease surface tension of the solution significantly. The surface tension of the solution equal to the critical surface tension of cabbage leaf and lower than the critical surface tension of peanut leaf, so the mixed adjuvants could be used to improve B and Mn uptake by crops.