The purpose of the present study was to compare the efficacy of the treatment of some pulmonary diseases with or without LLLT. 130 patients (49 of them with acute pneumonia, 42 - with chronic bronchitis, 39 - with chronic bronchial asthma) received LLLT and drug therapy, and 30 patients received only drug therapy (control group). The obtained results on the use of LLLT show that the period of convalescence in patients with both pneumonia and exacerbation of chronic bronchitis was lower with 4 - 6 days compared with control group. 68% patients with chronic bronchitis have staunch remission more than three month. Patients with bronchial asthma reported the decreasing of both number of bronchospasm and doses of bronchodilators and glucocorticoids after LLLT. They have no exacerbation of asthma during 3 - 6 months; then these patients need the repetition of LLLT. In conclusion, LLLT is the suitable and effective complement to the treatment of pulmonary diseases.