New classification system of {\sl Yulania denudata}

Studying on the history of classification of Yulania denudata and the specimens which were gathered by author for many years. The results indicate that Y. denudata is a commurlity which has both wild and cultivated plant, and which has morphological diversity. Based on these results, authors put forward the new classification system of Y. denudata, that is species-subspecies-varieties, which concludes 2 subspecies ( 1 new combination subspecies), 6 varieties ( 1 new variety and 3 new translation varieties). The development of deformation theory, selection and utilization of new cuhivars of Y. denudata can be based on these results.