The structures of different vegetative organs and the distribution law of secretory canals in different vegetative organs of Peucedanum praeruptorum Dunn were investigated by paraffin section method.The results showed that:1)the taproot of P.praeruptorum Dunn was formed by periderm,pericyclic parenchyma tissue and secondary vascular tissue from outside to inside and the pericyclic parenchyma tissue was a structure that was different from the common structure of herbaceous plants in dicotyledon.The stem was composed of epidermis,cortex and vascular tissues from the exterior to the interior;the leaf was a bifacial leaf.2)There were secretory canals in all vegetative organs of P.praeruptorum Dunn,including the root,the stem and the leaf.The secretory canals were distributed in pericyclic parenchyma tissue and in secondary phloem of the root;in the stem,they were in the cortex and the pith;and in the leaf,they were in the parenchyma around the vascular.The research could offer the anatomic data for discussing the relationship between the distribution of secretory structure and the accumulation of secondary metabolites.