The purpose of the study was to evaluate the frequency of isolation of multi-resistant Pseudomonas aeruginosa and identify the mechanisms of resistance to carbapenems.Material and methods. We analyzed 866 strains of Pseudomonos aeruginosaisolated from clinical samples from cancer patients in the period 2014–2016. the level of resistance to piperacillin/tazobactam, ceftazidime, cefepime, imipenem, meropenem, ciprofloxacin, amikacin in dynamics was determined. carbapenem-resistant (car-R) strains were examined for the presence of enzymes.Results. Between 2014 and 2016, the number of strains resistant to piperacillin/tazobactam was 20.1–12.9 %, to ceftazidime – 33.0–32.9 %, to cefepime – 25.6–32.9 %, ciprofloxacin – 36.8–43.8 %, amikacin – 23.8–24.9 %. No statistically significant differences were found (p>0.05). However, an increase in the number of car-R strains from 31.7 to 43.8 % was observed (p<0.05). of 7 strains of P. aeruginosainvestigated for the presence of acquired carbapenemases, the production of metal-beta-lactamase of group Vimwas detected in 2 strains, and class acarbapenemases of the gEs-5 group in one strain.Conclusion. P. aeruginosaresistance to all antibiotic groups did not exceed 50 % and remained almost unchanged for 3 years, with the exception of the increase in car-R strains. three out of 7 (42.9 %) carbapenem-resistant strains were genetically stable.