This study was conducted for a full understanding of the growth characteristics of the bark of Eucommia ulmoides Oliv and of its gutta-percha content characteristics as well as the content variation, which as a result provides a theoretical basis for its new clones' selection and effective utilization. Typical sample-tree selection and random selection were applied in this study. Integrated extraction was applied to the gutta-percha content rate test. The results show that different characteristics of the bark and its gutta-percha content were observed among different variance-types. In terms ...