Objective To retrospective analyze the sputum bacteria culture result,resistance and the relation with pulmonary function of chronic obstructive pulmonary disease(COPD)during acute exacerbation stage,and offer suggestion for anti-bacteria drug selection in the local region.Methods From February 2005 to February 2008,116 patients who has been given therapy due to COPD in acute exacerbation stage were randomly selected,among whom 76 cases showed positive result in sputum bacteria culture.And we analyzed retrospectively on them.Results In these 76 cases of sputum bacteria culture positive patients,51 cases were affected by gram-negative bacteria(67.11%),18 cases by gram-positive bacteria(23.68%),and 7 cases by fungi(9.21%).The most common four types bacteria affection were:11 strains of Pseudomonas aeruginosa(14.47%),9 strains of Escherichia coli(11.84%),7 strains of Acinetobacter baumannii(9.21%)and 7 strains of Staphylococcus epidermidis(9.21%).The fungi affection was Candida albicans.The drug sensitive test showed that the first five types of bacteria had high resistance to regular antibiotics such as piperacillin,ciprofloxacin,cefoperazone.In COPD patients,with the exacerbation of pulmonary function being damaged,Pseudomonas aeruginosa,Enterrobacter and Acinetobacter had high detection rate.Conclusion For the patients in acute exacerbation stage of COPD,respiratory tract infection was mainly caused by gram-negative bacteria,the result of sputum bacteria culture had close relationship with the pulmonary function damage of patient.