Treatment with glucocorticoid for acute exacerbations of COPD results in the improvement of clinical outcomes. However, the optimal doses of glucocorticoid for each individual patient has not been determined. According to GOLD Report 2014, a dose of 40 mg prednisone per day for 5 days is recommended (Evidence B), although there are insufficient data to provide firm conclusions concerning the optimal duration of corticosteroid therapy of acute exacerbations of COPD. The purpose of the current study is to compare clinical outcomes of personalized or fixed or experiential dose of glucocorticoid in patients with acute exacerbations of COPD.