A field trial was carried out to study the effect of different K supply on the grain yield,K acquisition and utilization of eight rice cultivars.Results showed that there were significantly genotypic variations in rice grain yield,K utilization efficiency and shoot K accumulation at different growth stage under two different K supply.Compared with normal K supply, rice grain yield and shoot K accumulation were decreased,and K utilization efficiency was increased under low K supply.Correlation analysis showed that under low K supply rice grain yield was positively correlated with K utilization efficiency,shoot K accumulation of both growth early stage and growth mid-stage(p<0.05),and under normal K supply rice grain yield was positively correlated with K utilization efficiency and shoot K accumulation of growth early stage(p<0.05).Therefore,screening and breeding rice genotypes with higher K utilization efficiency and higher ability to accumulate K at growth early stage would probably be one of alternatives to alleviate the K deficiency of paddy soil in south of China.