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Objective: The aim of this study was to study the changes of SGC-7901 cells transfecting small hairpin RNA (shRNA) targeted Bcl-2 and celecoxib in vitro. Methods: To use the effective siRNA targeted to Bcl-2 by Lipofectamine 2000, the rate of cell growth inhibition of all groups was detected by multiply-table tournament (MTT) method, apoptosis rate was examined by flow cytometry and the expression of Bcl-2 was assayed by Elisa. Results: After siRNA was transfected to SGC-7901 cells, the rate of cell growth inhibition was increased, the joint group was higher by flow cytometry and the expression of Bcl-2 was lower by Elisa. Conclusion: The growth of SGC-7901 cells which was transfected siRNA has been inhibited, and the sensitivity to celecoxib has been increased.