【Objective】The present experiment was conducted to find out the biological effects of soaking rapeseeds in light rare-earth metals (La， Ce， Nd， Pr) on resistance of rapeseed plants to Cd and Cr stress in order to provide a theoretical reference for agricultural application of rare earth metals in soils polluted with heavy metals. 【Method】The growth and development of rapeseed plants and Cd and Cr uptake and accumulation in rape plant was investigated under Cd and Cr stress by soaking rapeseeds in single light rare earth metals， viz.， La， Ce， Nd， Pr in pot culture. 【Result】The results showed that the Cd and Cr stress in soil had no significant effects on the growth and development of rapeseed plants， rather it increased Cd and Cr content and their accumulation. La， Ce， Nd and Pr seed-soaking treatments inhibited the uptake and translocation of Cd and Cr from soil to stem and leaf of rapeseed plant， and the inhibitory effects differed with respect to growth and development stage， soil pollution extent and rare earth element type. At higher heavy metal pollution， the ability of rape to resist heavy metal poisoning increased， and the Ce soaking treatment showed best effect. At the same time， the dry matter accumulation in rape stem and leaf was enhanced. 【Conclusion】Seed-soaking in light rare earth metal is an efficient way to inhibit heavy metal uptake and decrease its accumulation.