Bladder cancer is the most common malignancy of the urinary system.Compound Kushen Injection (CKI) is a Chinese medicinal preparation that has been widely used in the treatment of various types of cancers in the past two decades.However,the pharmacological effect of CKI on bladder cancer is not still completely understood.In the current study,network pharmacology com-bined with bioinformatics was used to elucidate the therapeutic mechanism and potential targets of CKI in bladder cancer.The mech-anism by which CKI was effective against bladder cancer was further verified in vitro using human bladder cancer cell line T24.Net-work pharmacology analysis identified 35 active compounds and 268 target genes of CKI.Bioinformatics data indicated 5500 differen-tially expressed genes associated with bladder cancer.Common genes of CKI and bladder cancer suggested that CKI exerted anti-blad-der cancer effects by regulating genes such as MMP-9,JUN,EGFR,and ERK1.Functional enrichment analysis indicated that CKI ex-erted therapeutic effects on bladder cancer by regulating certain biological processes,including cell proliferation,cell migration,and cell apoptosis.In addition,Kyoto Encyclopedia of Genes and Genomes enrichment analysis implicated pathways related to cancer,bladder cancer,and the PI3K-Akt signaling pathway.Consistently,cell experiments indicated that CKI inhibited the proliferation and migration of T24 cells,and induced their apoptosis.Moreover,RT-qPCR and Western blot results demonstrated that CKI was likely to treat bladder cancer by down-regulating the gene and protein expression of MMP-9,JUN,EGFR,and ERK1.CKI inhibited the prolif-eration and migration,and induced the apoptosis of T24 bladder cancer cells through multiple biological pathways and targets.CKI also exhibited significant effects on the regulation of key genes and proteins associated with bladder cancer.Overall,our findings provide solid evidence and deepen current understanding of the therapeutic effects of CKI for bladder cancer,and further support its clinical use.