A new sweetpotato cultivar Xushu 27 with high yield and high starch content was developed from the cross between Xushu 18 with good quality as the maternal parent and 20 varieties (or lines) with great difference in genetic background as the paternal parents through open-pollinated group method. In 2009, this cultivar was approved by the Crop Varieties Appraisal Committee of Shandong Province. The agronomic characteristics, productivity, disease resistance, quality characteristics, and starch pasting properties of Xushu 27 were studied. This cultivar had strong sprout ability, smooth vine growth, strong storage ability, high resistance to root rot, and moderate resistance to rot nematode. In Comparison with Xushu 18, fresh root yield and dry matter yield of Xushu 27 increased by 19.41% and 19.21%, respectively, which indicated a potential of super-high yield. Rapid Visco Analysis (RVA) curve of Xushu 27 starch showed a typical A-shape. The starch RVA parameters with different fertilizer treatments were significantly different. Organic fertilizer reduced the value of starch peak viscosity, hot paste viscosity, and cool paste viscosity. The gelatinization temperature ranged from 75°C to 80 °C.