Abstract: The seed germination, seedling growth, the index of root cell mitosis of rice were increased by LaCl3, when the concentration of LaCl3 was lower than 1.0 mg/L, and the activities of peroxidase and IAA-oxidase were decresed. But the seed germination, seedling growth, root cell mitosis of rice were retarded when the concentration of LaC13 was higer than 5.0 mg/L, the activities of both enzymes were increased.