OBJECTIVE To investigate genes associated with the drug-resistance of ?-lactamases antibiotics in Pseudomonas aeruginosa(PAE) and type Ⅰ integrating enzyme gene isolated from clinical patients.METHODS The drug-sensitivity for 16 antibiotics were detected by the disc agar diffusion(DAD) and microdilution.To ditect the related drug-resistence genes TEM,SHV,OXA-10,PER,VEB,GES,CARB,IMP,VIM,SPM,GIM,DHA,F-OX,MOX,CTX-M9,CTX-M1 and outer membrane protein gene oprD2 and 18 main drug resistance genes of typeⅠ integrating enzyme gene and others with PCR method.RESULTS Resistant rates of 34 multidrug resistant P.aeruginosa(MRPA)strains for amikacin,ceftazidime,ciprofloxacin,cefoperazone/sulbactam,cefepime,imipenem,levofloxacin,piperacillin/tazobactam,aztreonam,piperacillin and tobramicin were 14.7%,29.4%,61.8%,67.6%,70.6%,73.5%,76.5%,76.5%,79.4%,91.2% and 94.1%,respectively,with 100.0% for others antibiotics.The positive diagnosis rates of gene encoding extended-spectrum ?-lactamases FOX,IMP,DHA,and VIM were 23.5%,11.8%,11.8% and 5.9%,24(70.6%) were deleted in outer membrane protein gene oprD2,other ?-lactamase genes were absent in all isolates,the type Ⅰ integrating enzyme gene intⅠ1 was positive in 34 strains.CONCLUSIONS P.aeruginosa carries various ?-lactamases genes in clinical PAE patients,and the deletion ratio of oprD2 gene is high,type Ⅰ integrating enzyme exists largely in MRPA.