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Aims-To further investigate the anti-colorectal carcinoma (CRC) effect of Sophoridine (SRI) which is a quinolizidine alkaloid extracted from a traditional Chinese medicine (TCM) Sophora alopecuroides L.and detect the mechanism involved,provide some basis for the development of Sophora alopecuroides L..Main methods-The anti-proliferation of SRI in human colorectal cells SW480 were detected by MTT assay.The potential mechanism of anti-proliferation was also investigated using apoptosis assays.The rate of apoptosis cells was detected also.The apoptosis-related proteins caspase-3,caspase-7,caspase-9,and PARP were determined by western blotting analysis.In animal studies,nude mice were subcutaneously injected with SW480 cells in the armpit to establish the xenograft tumors and administrated with different drugs (control,5-Fu,SRI H,and SRI L).The general state of health of the mice and the growth of tumors were observed and the inhibitory rate was calculated.The pathology and ultrastructure of xenograft tumors treated with SRI were observed also.Key findings-SRI significantly inhibited the growth of SW480 cells,and the administration of SRI significantly inhibited the growth of xenograft tumors without apparent toxicity.SRIs mechanism of action involved the induction of apoptosis.Signicance-These results suggest that SRI produces obvious anti-tumor effects in vitro and in vivo.It supports the viability of developing SRI as a novel therapeutic prodrug for CRC treatment,as well as providing a method for identifying new anti-tumor drugs in TCM.