Abstract: For improving yield and commodity rate of micyo-sweetpotato, taking ‘Ningzi 2-2’ as material, through randomized block design, the yield and commodity rate were studied. The results showed that the timely plant destiny and harvest time could increase yield and commodity rate of mini-sweetpotato. The yield of fresh sweetpotato was the highest at plant spacing of 16 cm before mid-September, and there were significant difference among each treatments, while the yield of fresh sweetpotato reached highest after mid-September was the plant spacing of 8 cm. With the increase of plant spacing, the number of sweetpotato reduced. The commodity rate under plant spacing of 16 cm was the highest, followed by 18 cm. Experimental result showed that the best plant spacing was 16 cm, which could enlarge photosynthetic area, increase photosynthetic accumulation, improve yield and commodity rate of fresh sweet potato.