Abstract:Pot and field experiments were conducted to study the mechanism of rare earth (RE) on effect of increase peanut yield. Results showed that the peanut seeds soaked with the suitable rare earth concentration, not only increased chlorophyll content and photosynthetic intensity, but also chlorophyll in leaf cell enhanced. The chloroplastid texture intact, and the amounts of basal granule lamella increased with tight arrangement, and improved the absorption and transformation of light and energy. The distribution of rare earth in peanut order was root>leaf> stem> shell>pome; and the amounts of absorption order was leaf>root> stem>shell>pome.