The analysis results showed that WBC count, ALB level, consolidation range more than 2/3 of the lung lobes, the use of macrolides within 5 days of disease course, the use of glucocorticoid or fiber bronchoscopy treatment within 2 weeks of disease course, and plastic bronchitis were independent factors influencing the occurrence of BO in patients due to RMPP. Here, ALB is linked to bronchiolitis obliterans syndrome.