Disclosed is the use of rupatadine in the manufacture of pharmaceutical composition for preventing or treating chronic obstructive bronchitis, obstructive emphysema or chronic obstructive pulmonary disease. The new medicament, i.e. rupatadine, for treating chronic obstructive pulmonary disease is obvious in therapeutic effects, and low in toxic and side effects, and safe in use in the aspects of treating chronic obstructive bronchitis, obstructive emphysema or chronic obstructive pulmonary disease.