Abstract: The integrated characters of Platycodon grandiflorum (Jacq.)A. DC. have been studied in this paper. It is concerned with morphology, anatomy and cytology;and with some respects of biology especially. There are no distinct differences about morphology and anatomy among different populations. The xylem and phloem form a continuous cylinder. The vessel segments in the stem are scalariform perforations and in the root simple perforations.There are 5-6 colpates in the pollen grain. The chromosomes of the somatic cell are 18.×=9. All of these characters are common in different populations and considered as primitive. Polymorphism of flower color, the blue type and white type, which is correlated with the contents of the saponin exists in populations. The life-span of the seeds stored at low tempera-ture (0°-4℃) can be prolonged to 2 years, but generally, it is only 1 year. The rhythum of the growth and development of Platycodon rgandiflorum from Zhejiang province is different from which in Heilungjiang province. When the seeds come from Zhejiang and grow in Harbin, their growth period is longer and the product of their roots is better than the native ones. In this case, it is evident that the research of plant bio-logy, as shown in this paper, has not only theoratical value but also practical value