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OBJECTIVE To inhibit the expression of the vascular endothelial growth factor (VEGF) by RNA interference, and to observe the effect in different cells line.METHODS Using the services of E-RNAi, we designed and constructed two kinds of shRNAs expression vectors which were aimed at the VEGF gene. These vectors were then transfected into HEK293, colon cancer HT29, Hela and HepG2 cells by LipofectamineTM 2000. The level of VEGF mRNA was determined by RT-PCR and North blotting and the VEGF expression was examined by immunofluoresence staining.RESULTS The two kinds of VEGF specific shRNAs expression vectors were found to efficiently inhibit the expression of VEGF in HEK293 and HT29 cells by RT-PCR analysis, with inhibition rates of 72% and 42%,respectively; but the inhibition rates were reduced to 28% in Hela cells and 13% in HepG2 cells. North blotting showed that the inhibition rates of VEGF mRNA expression were 88% and 89% in HEK293 and HT29 cells, respectively. The inhibition rate of VEGF protein expression in HT29 cells was 73% based on immunofluoresence staining.CONCLUSION The expression of VEGF was inhibited by RNA interference, but differed with various cells lines, showing that RNA interference was cell-line dependent.