The objective of the research was to evaluate the influence of basic treatment of patients with chronic obstructive pulmonary disease with tiotropium bromide on the processes of morphological rearrangement and local barrier defence mechanisms in the bronchial mucosa.          Stage II chronic obstructive pulmonary disease is associated with the damage to the bronchi with proliferation of the connective tissue in its proper plate, clear identification of the basal membrane alteration, the presence of fibroblasts, the activation of fibroblasts/myofibroblasts and mucous glands, which is accompanied by the significant increase of type ІV collagen levels by 6.19 times (p<0.05) in bronchoalveolar lavage fluid as compared to the control group indices.          The elimination of stage II chronic obstructive pulmonary disease exacerbation and the use of tiotropium bromide within a month was accompanied only by partial improvement of morpho-functional state in relation to both cells of bronchial epithelial lining and adjacent connective tissue of mucosal plate. The prolongation of tiotropium bromide administration from 2 to 6 months, provided positive dynamics of structural morphological changes of the bronchial mucosa (the restoration of the ciliary apparatus of epithelial cells, the normalization of the secretory function of goblet cells, the inactivation of fibroblasts, the initial degeneration of myofibroblasts), thus leading to complete absence of morphological signs of edema or epithelial cell dystrophy.          Conclusions. In patients with stage II chronic obstructive pulmonary disease, complete absence of morphological signs of edema or dystrophy of epithelial cells, against the background of collagenolysis in the connective tissue of the proper mucous plate of the bronchi and the highest possible decrease in the number of myofibroblasts, with near-complete levels of type IV collagen normalization in the bronchoalveolar lavage fluid, were identified only within a 6-month treatment with tiotropium bromide.