Studies on phosphorus efficiency of native soybean (Glycine max (L.) Merrill) genotypes in Guangdong and relationship between phosphorus efficiency and content of soil available phosphorus of original region were conducted in low-phosphorus red soil.Results are as follows:(1) The field growing performance under low-phosphorus acidic red soil and the phosphorus efficiency of soybean genotypes can be explained better with Relative Value of Plant Phosphorus Uptake (RVPPPU) as an index. The higher the RVPPU of soybean genotypes is, the better the field growing performance and the phosphorus efficiency are, and vice versa.(2) Genetic variability in respect to phosphorus efficiency exists within soybean genotypes from different native region. As compared with those from soil and fluvo-aquatic soil with higher content of soil available phosphorus, soybean genotypes from latosol, lateritic soil,red soil and purple soil with lower availability of soil phosphorus have better characteristics of phosphorus efficiency in native regional soil where they had evolved for a long time.