The invention relates to a new use of magnolol compound or its isomer or a pharmaceutically acceptable salt or drug delivery system of these compounds for treatment of bladder cancer and/or inhibition of cancer metastasis and/or improvement of cachexia.本發明係關於一種厚朴酚化合物或其同分異構物或該等化合物之醫藥上可接受鹽類或藥物輸送系統製備用於治療膀胱癌及/或抑制癌轉移及/或改善惡病質的藥劑之用途。