Abstract: The effects of Zn²⁺activity on seedling growth and Zn uptake of rice differing in resistance to Zn-deficit show that when the Zn²⁺ activity is low, the growth and development of rice is inhibited; the plant height, leaf number, and dry matter accumulation of rice decrease with the decreasing of Zn²⁺ activity, while the ratio of root to shoot and the Zn concentration ratio of shoot to root increase;Zn transferring capacity,supporting the root growth capacity of Zn-efficient rice genotype‘IR8192’are higher than those of Zn-inefficient rice genotype‘IR26’as Zn deficiency.