目的对复达欣治疗老年严重院内肺部感染的疗效及其抗菌活性进行分析，评价其目前的临床应用价值。方法３０例患者应用复达欣治疗后，痰培养分离的２５株致病菌与同期１９６株革兰氏阴性菌进行纸片法药敏试验对比观察。结果复达欣治疗的有效率为８０％，细菌清除率为７６％。结论复达欣目前仍然是广谱有效的抗生素，尤其对老年人严重细菌感染是一种可选择的抗生素之一 OBJECTIVE To evaluate the efficacy and antimicrobial activity of multidrug in the treatment of elderly patients with nosocomial pulmonary infection and evaluate its clinical value. Methods Thirty patients with pathogenic bacteria isolated from sputum culture and 196 strains of Gram-negative bacteria from sputum culture were used to observe the susceptibility test of paper after the treatment of Fu Daxin. Results Du Danxin treatment efficiency was 80%, bacterial clearance rate was 76%. Conclusion FDF is still a broad-spectrum effective antibiotic, which is one of the most important antibiotics in the elderly, especially for severe bacterial infections