Through hydroponic experiments with two different K concentrations, ten characteristics of 117 accessions of rice varieties provided by the Integrated International Rice Molecular Breeding Program were compared at the seedling stage. The result indicated that the seedling characteristics with low-kalium water culture were obviously different from those with regular-kalium water culture, and there were significant difference among 117 varieties in two different regimes. According to the synthetic appraisal index consisted of the relative indexes of number of root, total root length, overground weight, underground weight and seedling height, nine varieties with high tolerance to low-kalium and 32 variety with tolerance to low-kalium were screened out.