Abstract: In order to screen and identify the varieties of purple sweet potato that were suitable to be planted in Anxi County, Funingzi No.3 was taken as the control group, the six varieties of purple sweet potato, including Longjinshu No.3, Quanzishu No.96, Longzi No.4, Longzi No.9, Funingzi No.5 and Jinshu 17, were screened out for the variety comparison test, in ordert to investigate the yield, quality, disease resistance, the growth dynamics and main characters of the aboveground and underground parts of each variety. The results showed that Longzi No.9 had high yield, high quality, high starch and disease resistance, and its comprehensive performance was the most outstanding, so it was suitable to be used as the high-quality variety of purple sweet potato in production. The yield of the fresh potato of Quanzishu No.96 and Jinshu No.17 was average, but the yield of starch was high, and the edible quality and appearance quality were both good, so they were suitable to be used as the high-quality variety of fresh purple sweet potato in production. The yield of the fresh potato and starch of Longjinshu No.3 at the harvest time was low, but the early-maturing performance was outstanding, so it was suitable to be used as the early-maturing variety in production.