Abstract: Abstract: Objective To investigate the clinical value and impact to PCT and hs-CRP of portable fiberbronchoscope alveolar lavage to elderly pulmonary infection respiratory failure in the treatment of mechanical ventilation. Methods 80 cases of pulmonary infection in the elderly patients with respiratory failure received invasive mechanical ventilation and anti-infection, expansion airway, expectorant, nutritional support treatment. The control group of 40 cases treated with conventional sputum suction tube suction phlegm. The observation group (bronchofiberscope group) of 40 patients added the use of portable fibrobronchoscope aspiration of sputum and alveolar lavage through tracheal intubation catheter, once every two days. Tested serum procalcitonin (PCT), high sensitive C reactive protein (hs-CRP), white blood cell (WBC), percentage of neutrophils (N), arterial partial pressure of oxygen (PaO2), arterial partial pressure of carbon dioxide (PaCO2) of two groups patients before the treatment and 1 week after the treatment. Change of each index were compared between the two groups before and after treatment. Invasive ventilation time, length of hospital stay, mortality and complications of the two groups were observed and compared. Results After 1 week treatment, PCT, hs-CRP, WBC, N, PaO2, PaCO2 compared with before treatment in two groups were significantly improved (P < 0.05). The indicators of observation group after treatment improved significantly better than the control group (P < 0.05). The invasive ventilation time, length of hospital stay, fatality rate in observation group was significantly lower than the control group (P < 0.05). Complications were no significance between two groups (P > 0.05). Conclusion Portable fiberbronchoscope alveolar lavage in respiratory failure of pulmonary infection in the elderly significantly decreased serum PCT and hs-CRP. This treatment is safe and effective in the treatment of invasive mechanical ventilation, and has important clinical application value.