Abstract:Based on studying the effects of the different rare earth concentration（100 mg/ kg ～ 400 mg/ kg）on the autumn buckwheat at seedling stage，the results indicated that rare earth spraying had no significant effect on growing period and yields. The plant height of spraying rare earth was decreased, and the branch numbers of the control were the highest (2.6 per plant) but other treatments were decreased which was enhanced with the increasing rare earth concentration.