Abstract: Quanshull was developed from the hybrization of Jinshan 1255/Quanshu218 by Quanzhou Institute of Agricultural Sciences in 1996. The variety performed high yield, stability, middle dry-matter content, resistance to stem rot and good storability. The study showed that high leaf area, high net assimilation rate were the most obvious characters, high biomass and high economic coefficient(0.85)indicated its potentiality of high yield. The results also showed that there might be a "Middle" type, beside "High Leaf Area" and "High Net Assimilation Rate" types in sweet potato.