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This research is applied Six Sigma methodology according to DMAIC (Define-Measure-Analysis-Improve-Control) to defective reduction in flexible packaging film production process from Biaxial oriented Polypropylene film (BOPP). In 2010 there was a product rejection from defective problem about 122,340.58 kg or 8,563,840.6 million baht. Regarding, to the 6 major defections. There were saggy film(SG) 2.58% wt, bad thickness(BT)1.91% wt , stain (ST) 2.3% wt , loosen winding (LW) 5.29% wt, wrinkle film (WR) 1.72%wt and corrugation (CO) 5.23%wt.After improvement evaluation by FMEA according to SOD. It’s achieved to reduce the major defect about 50% reduction which saved 4,281,920.3 million baht.