We conducted an anatomical study on the formation of adventitious roots of Tetraena mongolica stem cuttings by paraffin section method to investigate the rooting type,rooting position,and the relationship between rooting and callus generation,and the formation of adventitious roots.The results showed that:（1）T.mongolica has typical stem structure of woody plants and sclerenchyma was not found in the stem cortex.（2）Stem parenchyma tissues contained abundant starch grains and proteins.（3）There were no latent root primordia in stem cuttings.Root primordia were formed by the dedifferentiation of callus parenchyma cells and finally developed into adventitious roots.These anatomical observations indicate that callus is a prerequisite for the formation of adventitious roots and T.mongolica rooting belongs to callus rooting-type.