The present invention provides a composition for preventing or treating immune allergic airway disease, and uses of the composition in preparing drugs, wherein the composition comprises an effective amount of S-allyl-L-cysteine and a pharmaceutically acceptable carrier.本發明提供一種組合物用於預防或治療免疫過敏性呼吸道疾病之組合物,以及該組合物在製備藥物的用途,其中該組合物包含一有效劑量之S-烯丙基-L-半胱胺酸,及一醫藥上可接受載體。