Abstract: OBJECTIVE To investigate the effects of tetrandrine(TET) on the xenografted tumor of the human bladder cancer BIU-87 cell line on nude mice. METHODS Fourteen nude mice which had been inoculated with BIU-87 cells by subcutaneous injection into the right legs were divided into the PBS control group(7 mice) and the 25 μg·mL^-1 TET group(7 mice). After a month of transplantating tumor cell, mice were given PBS or TET into the tumor once every 3 days. Tumor volumes were measured every 3 days. RT-PCR was used to detect Bcl-2 and Bax mRNA expressions. The expressions of survivin and capseae-3 were detected by western-blot. RESULTS TET could inhibite the growth of xenografted tumor of human bladder cancer BIU-87 cells on nude mice, the inhibitory rate was 66.6%. RT-PCR analysis showed that TET significantly reduced tumor Bcl-2 mRNA expression and increased Bax mRNA expression (P<0.05); Western-blot showed that after TET treatment, the survivin protein markedly dropped, and capseae-3 protein expression increased significantly (P<0.05). CONCLUSION TET can inhibite the growth of xenografted tumor of human bladder cancer BIU-87 cells on nude mice. The molecular mechanism may be reducing the expressions of Bcl-2, survivin, and increasing the expression of Bax, capseae-3.