Validation: The 2003 through Jiangsu Province Crop Variety Approval Committee approval; 2005 identified by the National Accreditation Council sweet potato. Features Features: 7 to Yushu as female, male parent Sushu the 7th bred by sexual crossing. The varieties of high-starch, in the long vine, green stems, parietal, leaves, vein color, petiole colors are green, leaf heart teeth. Basal branching 6 to 7. Under tuber expansion spinning, red white meat, tuber neatly focused on the rate of 90% potato, tuber sprouting good summer tuber dry matter rate of 31.0 percent, 3.6 percentage points higher than the control. Yield: 2002 to 2003 participated in the Yangtze River Basin District Regional Trial sweet potato varieties, in 2002 the average yield of 2307.7 kg of fresh potatoes, a decrease of 1.9% compared with the control Nanshu 88, dry matter yield of 731.8 kg, compared with 88 south potato yield 8.9% ; 2003 average yield of 1818.7 kg of fresh potatoes, potato 88 south than the control cut 7.8, dry matter yield of 595.6 kg, compared with 88 south potato yield 8.9%. 2004 to participate in the production test, the average yield of 2399.86 kg of fresh potatoes, potato 88 south than the control cut 5.16%, dry matter yield of 707.19 kg, compared with 88 south potato yield 9.29%. Cultivation techniques features: volume control when planting seed, seed per square meter is about 18 kg, potato planting density in spring 3500 to 4000 / acre, summer, autumn potato 4000 ~ 5000 / acre. Virus-free seed useful life may be extended, timely drought, not in the sense of the stem nematode Ward promotion