Abstract:Genetic diversity of 176 sweetpotato landraces from 17 provinces in China, was analyzed using morphological traits. The accessions from the same origins were clustered into different groups, indicating that there was no direct relationship between genetic diversity and geographical origins. 176 landraces can be divided into five groups by UPGMA cluster based on euclidean distance . And two pairs of duplicate collections were found. The quality characters of 133 landraces were identified. 11 collections with high dry matter content and high starch content were screened, in which Baopiwang from Guangdong is the highest one with 34.87% dry matter content and 23.32% starch content of fresh sweetpotato respectively. The 11 landraces which soluble sugar content of fresh sweetpotato≥4.00% were screened, the highest one is Tengchongbendizhong of Yunnan, 5.22%. 2 landraces were screened with high raw protein content. The 133 landraces were clustered into five groups based on quality traits. The groupⅠincluded 28 landraces with high soluble sugar content, low dry matter and raw protein content. The groupⅡ was mainly composed with the landraces with low starch and protein content, high soluble sugar content. There was only 1 collection Tengchongbendizhong with the highest soluble sugar content in the groupⅣ. The groupⅤ includes 4 landraces from Guangdong with high starch content. The rest of the 86 landraces constituted the group Ⅲ.