Abstract: Effects of mixed cropping of maize and peanut on the Fe nutrition of peanut plant and the available Fe content in the rhizophere of peanut were studied by pot experiment in sterilized soil．The results indicate that mixed cropping of maize and peanut can significantly improve the chlorophyll and active Fe contents in the young leaves of peanut，and the total Fe content of peanut shoots and the active Fe content in the rhizophere of peanut are also enhanced at the R₂ stage．Mixed cropping plays an important role in the improvement of the Fe nutrition of peanut．Soil sterilization can only improve the Fe nutrition of peanut at earlier growing stage．