Abstract: Sweet potato is one of the grain crops in China，the experiment introduced Sushu 8，Eshu3，Eshu4，Eshu5205，Yushu153，Yushu162，Yushu123 and YushuI2-8 eight good Virus-free sweet potato varieties，and were condtrasted with local variety “Banlishu ”.The plant character, the tuber-root form,the tuber-root number and bigger tuber-root number,the tuber-root yield and the dry matter rate in tuber-root were compared. The result showed that Sushu 8 had higher economic output and excellent characters,Sushu 8 variety could be extended in Yuxi City.