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Fifty  isolates   of  Psel.ldomonas  aeruginosa were  obtained   from (170)  isoiates  of ctlinical cases. Sensitivity  of the isolates t()  antibiotic leveled   showed   a   high   resistance    to   cefotaxime,  ceftazidime, gentamicin  and  tobramycin.  To  less  extent   was  the  resistance   to· amikacin  and  ciprofloxacine.  All isolates of        Pseudomonas aeru,ginosa were highly sensitive  tocefepime and imipenem. Eighty six  percent oJ the  isolates of  Pseudomonas aeruginosa produced  protease  enzyme  .The isolatt;: Number  (2) of  Pseudomonas cterugirwsa gave the highest  production  of  this enzyme. This. isolate was selected for protease purifica:tiort, using ammonium  sulfate precipitation and ion exchange, DEAE cellulose and gel filtration with sephadex G-100. Enzyme  activity  was  affected  by   some  antibiotics.  The activity  :was  reduced  with  incre ing   concentratiohs   of  these antibiotics..