Objective: To explore the immune function differences between acute exacerbations of COPD in susceptible populations and in unsusceptible populations,and the effect of thymopeptides enteric-coated tablets on immune function for susceptible patients with COPD acute exacerbation. Method: Patients were randomly divided into two groups: COPD exacerbations susceptible patients and COPD exacerbations unsusceptible patients. The immune function were compared and checked respectively. The COPD exacerbations suscept...