Analyses of yielding ability, disease resistance and quality were conducted for several years on sweetpotato true seeds introduced from International Potato Center. As a result, Xu 781, a new bred line was selected to have high disease resistance and high dry matter content. Its cross-incompatible group, adaptability to grafting stocks, genetic characteristics were also studied. The results showed that the genetic relationship of Xu 781 was far from local varieties. It had high dry matter content, high resistance to stem-nematode, easy flowering, high capsule setting ratio, and high selecting ratio of its progeny seedlings.Thus,it is a rare parental material.