【Objective】 The aims of the study is to know the origin and development process of adventitious roots of Aronia melanocarpa cutting, and reveal its cutting rooting mechanism. 【Methods】 Taking the semi-lignified cuttings of ''Fukangyuan No.1'' as the research material, the changes in internal structure and external morphology of cuttings during the formation of adventitious roots were observed by hydroponic cutting technology and paraffin section method. 【Results】 The results showed that under hydroponic conditions, the rooting period of IBA treated cuttings was 30-40 d. During the cutting process, adventitious roots appeared at 10-15 d at the lenticel, and adventitious roots appeared at 15-20 d at the cuttings incision, the rooting speed, number and root length were better than the control. The number of adventitious roots in the cuttings was the largest and the rooting was fast. Exogenous induction can significantly improve the rooting rate and rooting quality. There was no latent root primordium in the cuttings before cutting, and the adventitious root primordium was formed after cutting. The adventitious roots were formed into callus rooting type and internal meristem rooting type. Adventitious roots produced in the bark originated from vascular cambium and phloem parenchyma cells or cortex; the adventitious roots produced by the callus are specialized by the parenchymal cells in the callus; leaf gap or branch gap is the main area for the formation of adventitious root primordium and callus formation. [Conclusion] The cutting rooting belongs to the multi-site occurrence mode and belongs to the induced rooting type.