Abstract： Objective To explore the bi-level positive airway pressure non-invasive ventilation (BI-PAP) for chronic obstructive pulmonary disease (COPD)with respiratory failure,the value of the cure.Methods COPD patients with type Ⅱ respiratory failure 47 regular bi-level positive airway pressure non-invasive ventilation(BIPAP) ,recorded the change before treatment,on the plane two hours after one day,three days PH,PaO2 ,PaCO2,SPO2 change.Results All patients through the bi-level positive airway pressure non-invasive ventilation,the clinical symptoms significantly improved after treatment,blood gas analysis The PH,PaO2,PaCO2 ,SPO2 a significant improvement compared with before treatment (P ＜ 0.05).Conclusion The bi-level positive airway pressure non-invasive ventilation (BIPAP) for chronic obstructive pulmonary disease (COPD) with respiratory failure has a significant effect.