Objective To study the proliferation inhibition effect by silencing PLCε gene expression with RNA interference in BIU-87 cells. Methods The specific short hairpin RNA recombinant plasmids were constructed by gene clone technology.The expression level of PLCε protein and mRNA were detected by Western blot and RT-PCR respectively after transfected recombinant plasmids into BIU-87 cells.The influence on proliferation was check by MTT.The changes of proliferating cell nuclear antigen(PCNA)were analyzed by immunocytochemical method,and the distribution of cell cycle was analyzed using flow cytometry. Results After transfected with the specific recombinant plasmids,PCNA expression was decreased 33.08%,and the analysis of cell cycle indicated that cells of G0/G1 phase were increased comparision with(40.75±2.30)%and(40.00±1.76)0A,and its G2/M phase cells(8.16±0.51)%were decreased strikingly compared with group control(31.20±1.76)%and group NP(35.94±1.58)%.Cells were blocked at G0/G1 phase,the cell proliferation was inhibited obviously. Conclusion PLCε may play an important role in proliferation of bladder cancer cells,which could be a potential target of biological treatment on bladder cancer in the future.