Objective To investigate the distribution and drug resistance of pathogens in intensive care unit(ICU)causing nosocomial infections so as to provide scientific basis for antibiotic adoption and the prevention and control of nosocomial infections. Methods The specimen sources and the clinical distribution of the 381 pathogens isolated from 2007 to 2011 were retrospectively analyzed. The drug resistance was observed in ICU that causing nosocomial infections. Results The sputum was the major specimens source in ICU, accounting for 78.2%. Of the 381 pathogens causing nosocomial infections in ICU, the 262 gram-negative bacilli (68.8%), 70 gram-positive cocci (24.9%),and 49 fungi (17.4) were isolated, Among gram-negative bacilli the top three were acinetobacter baumannii (24.7%), klebsiella pneumonia(10.8%),and pseudomonas aeruginosa (9.2%). The drug resisitance rate of baumannii to antibiotics were more than 40%,beside carbapenem and B-Lactamaseinhibitors. The main gram-positive cocci of causing nosocomial infections was saphylococcus aureus in ICU. The drug resisitance rate of S. aureus to penicillin, erythromycin and gentamicin were higher than 50.0%. Conclusion The main distribution area of nosocomial infections was the respiratory tract and the gram-negative bacilli were the common pathogens in ICU. It was benefit to avoid presenting of drug resistant strain, and antibiotics should be reasonably used in clinic.