Objective To investigate the use of antimicrobial drugs in our hospital and provide guide for clinical use of antimicrobial drugs.Methods Tabulate and analyze the usage of antimicrobial drugs according to the discharged patients' medical records from Jan 2004 to Dec 2006.Then use statistical methods for retrospective survey.Results Among 4003 medical records,2756 of them used antibiotics,with the percentage being 68.85%.1103 recodes used combined medication,which accounted for 40.02% of the total records.Type I incision occupied 90.86% in surgical departments.The percentage of the inpatients who used antimicrobial drugs after operation for about five to seven days was 78.85%.For selecting drugs,the majority were empirical antibiotics treatment,which achieved 93.72%.The ratio of irrational use of drugs was 25.90%.Conclusion The clinical use of antimicrobial drugs in our hospital is dramatically lower than the average level of the whole nation.However,non-standardized administrations of medication,super-standardization,super-range use of drugs are still the problems needed to solve.