Objective Estimating the treatment to respiratory failure in acute exacerbation of chronic obstructive pulmonary disease by scores in the form of quantitative assessment.Methods 156 patients with chronic obstructive pulmonary disease with acute exacerbation of respiratory failure in patients in the medical intensive care unit based on the worst value of the calculated APACHEⅡ score were grouped,divided into groups and pairs of oxygen the level of non-invasive positive pressure ventilation group.Based on the worst values calculated by the APACHEⅡ and TISS-28 score within 24 h after admission into MICU selected cases is re-grouped into an effective group of oxygen,BiPAP effective group and invasive ventilation group.Statistics separately for each group of patients with APACHEⅡ score and TISS-28 score range,length of stay.Results The invasive ventilation group APACHEⅡ score(27.44?6.79)and TISS-28 score(28.22?7.90)was significantly higher than the other groups(P0.05),invasive ventilation group and effective group MICU hours of BiPAP have significant difference(P