The yield, nutritive content and eating quality of 28 sweet potato cultivars were evaluated in Hainan, China. The results indicated that: ①Cultivars Yanzishu 176, Hainan Heiroushu and Xushu 23 could be considered as promising breeding materials. ②The average fresh root yield, dry root yield and starch yield of purple sweet potato were 62.3%73.2% of those of the yellow and white sweet potato, but the protein, vitamin C and carotene content of the purple sweet potato were higher than those in the yellow and white sweet potato. ③There was very significantly positive correlation between fresh root yield, dry root yield and starch yield; The fresh root yield was clearly negative correlated with dry matter content and starch content; The dry matter content was very significantly positive correlated to starch content; The soluble sugar content was very significantly positive correlated to dry matter content and starch content; The vitamin C content was very significantly positive correlated to dry matter content, starch content, soluble sugar and protein content; There was no significant relationship between the eating quality and the nutritive yields and nutritive content.