BACKGROUND: Triple therapy with inhaled corticosteroids and dual bronchodilator therapy is recommended for chronic obstructive pulmonary disease (COPD) patients who have exacerbations and eosinophilia. It can be administered by single inhaler triple therapy (SITT) or by multiple inhaler triple therapy (MITT). There is a lack of evidence of the benefits of SITT over MITT in the Chinese population, especially on switching from existing MITT to SITT. METHODS: A total of 70 Chinese patients with COPD were recruited in this open-label, double-arm clinical trial to investigate the number of critical inhaler errors, the modified Medical Research Council (mMRC) dyspnea scale, the Medication Adherence Report Scale for Asthma (MARS-A) score, and a satisfaction score upon switching from MITT to SITT. RESULTS: The mean number of critical inhaler errors was 0.4±1.0 in the SITT group and 1.1±1.8 in the MITT group( CONCLUSION: Switching from MITT to SITT in Chinese COPD patients may have the benefits of having fewer critical inhaler errors and a higher MARS-A score.