Abstract: Objective To explore the effect and mechanism of resveratrol on cell cycle of human gastriccancer MGC-803 cells.Methods The blank control group,low dose resve rstrol group(25μg/mL)and high dose resve rstrol group(50μg/mL)were a rranged in the experiment.After the admin is tering of resverstrol to experimental groups for 24hr,the inhibition rate of cell prolife ration was measured with methyl-thiazolyl-tetrazolium method.The colony forming and the cell cycle were analyzed with flow cytome try,and them RNA expression of bcl-2,c-myc gene were determined with RT-PCR method.Results Resveratrol could markedly inhibit prolife ration of human gastric cancer cells compared with that of the blank control group.The cell cycle was blocked to G0/G1.The mRNA level of bcl-2 and c-myc gene were decreased compared with that of the blank control group.Conclusion Resverstrol could inhibit cell proliferation and block the cell cycle to G0/G1 in hum an gastric cancer MGC 2803 cells.The effects might be related to decreased expression of bcl-2 and c-mycgene.