Environmental problems have attracted much attention due to pulmonary diseases，and modern clinical studies have proved that Weijing decoction has a good therapeutic effect on pulmonary diseases such aslung abscess，chronic obstructive pulmonary disease，lung cancer，and severe pneumonia.Weijing Decoction has the effect of clearing heat，dissolving phlegm，and draining pus.This article mainly summarizes its applications primarily in pulmonary diseases.Clinical studies have shown that Weijing decoction not only enhances clinical effectiveness but also significantly shorten the time for lowering inflammatory indicators，reduce the use of antibiotics，and minimizes adverse reactions.Existing pharmacological studies have shown that the main active ingredients of this decoction are stigmasterol，β-sitosterol，hederagenin，aurantiamide acetate，ferulic acid，etc.Basic research indicates that its mechanism of action may be related to inducing cell apoptosis and regulating immune balance.