Objective To investigate the correlation factors of elderly patients with inguinal incarcerated hernia surgery related lung infection. Methods A hospital-based 1∶1 matched case-control study was conducted among elderly patients with inguinal incarcerated hernia surgery related lung infection,calculated the factors associated with the extent of lung infection,and the 95% confidence interval. Results The analysis showed that pre-ALB≤35g/L（P=0.013）,pre-Hb≤100g/L（P=0.029）,COPD（P=0.014）,smoking（P=0.008）,operation time（P=0.021）,bowel resection（P=0.032）,endotracheal intubation（P=0.024） and operation in winter（P=0.030） were the risk factors of lung infection,while the prophylactic use of antibiotics（P=0.018）,aerosol inhalation（P=0.023） and good sleep（P=0.048） were the protective factors. Conclusion Some biochemical indicators,past history,therapeutic process and environmental factors were closely related to inguinal incarcerated hernia surgery related lung infection in elderly patients.