Abstract: OBJECTIVE To analyze the value of procalcitonin (PCT) and endotoxin (ET) in diagnosis of postoperative pulmonary infections in patients with abdominal trauma so as to provide guidance for clinical diagnosis. METHODS A total of 88 abdominal trauma patients complicated with postoperative pulmonary infections who were treated in the hospital from Jan 2015 to Dec 2015 were enrolled in the study and divided into the bacterial group with 30 cases and the non-bacterial group with 58 cases according to the pathogens causing infections.The levels of serum PCT and ET of the two groups of patients were detected, and the statistical analysis was performed. RESULTS The positive rates of PCT and ET were significantly higher in the bacterial group than in the non-bacterial group(P＜0.05).The sensitivity and specificity of PCT were respectively 93.3% and 94.8% in the diagnosis of postoperative pulmonary infections in the patients with abdominal trauma; the sensitivity and specificity of ET were respectively 66.7% and 69.0%, and there was significant difference between the two groups(P＜0.05). CONCLUSION The detection of PCT and ET has remarkable clinical value in diagnosis of the postoperative pulmonary infections in the patients with abdominal trauma; the PCT has higher diagnostic value than ET, and it can be chosen as the preferred diagnostic indicator.