Through the experiments on La~(3+), this paper made a research on the influences of the rare earth element lanthanum on the sprout of the seeds of rice and the growth of the seedlings. And on the basis of the above research, with 10mg·L~(-1) La~(3+) as the biological regulator and through the nourish liquid cultivating experiment, further researches were made on the influences of lanthanum on the physiology , the bio-chemistry and the growth index of the seedlings of rice under stress (heavy metals , salts ...