Abstract: A new sweet potato strain 99-12 with high resistance to Ralstonia solanacearum and Fusarium oxysporum was bred from Chaoshu 2 (female parent)/97-10 (male parent) in 1999. It had characteristics with high yield and good quality. It also possessed high sprouting ability and good tuberous root shape. The balance of T/R value occured at the time when transplanted 100 days.