Through the clinical observation of Qingcheng Pingxian Granules in the treatment of acute exacerbation of chronic obstructive pulmonary disease (phlegm-heat lung syndrome), (1) to evaluate the safety of Qingcheng Pingxian Granules in the acute exacerbation of chronic obstructive pulmonary disease; (2) to observe the clinical efficacy of Qingcheng Pingxian Granules in the treatment of acute exacerbation of chronic obstructive pulmonary disease, to provide an effective medication and solution for the treatment of acute exacerbation of chronic obstructive pulmonary disease, and to provide data for the development of the further application of Qingcheng Pingxian Granules.

Inclusion Criteria:

1. Meet the diagnostic criteria of AECOPD.
2. Chinese medicine diagnosis is consistent with phlegm-heat and lung depletion evidence
3. 40 years old ≤ age ≤ 90 years old
4. Patients who signed the informed consent form and volunteered to participate in the study

Exclusion Criteria:

1. Combined with other primary lung diseases such as bronchial asthma, bronchiectasis, etc.
2. Combination of serious cardiovascular, urinary, digestive, haematopoietic, endocrine metabolic system diseases, other psychiatric and neurological diseases.
3. Pregnant or lactating patients.
4. Allergic to the clinical trial drugs.