A new method was developed for the determination of borax（boric acid） in puffing foods using non-suppressed ion chromatography.The samples were extracted with methanesulfonic acid by ultra-sound.The solution was made passed through OnGuard Ⅱ RP，Ag column，Na column and filter membrane after centrifugation and filtration.The separation of boric acid was performed on an anion exchange column of Dionex Ionpac AG16（50 mm×4 mm） +AS16（250 mm×4 mm） with 5 mmol/L sodium hydroxide by isocratic elution at a column temperature of 30 ℃.The optimum chromatography conditions were investigated.Under the optimal conditions，the calibration curve for boric acid showed a good linearity in the range of 0.3-3.0 mg/g with correlation coefficient of 0.999 5.The spiked recoveries for boric acid were in the range of 78%-105% with RSDs of 1.5%-4.6%.The detection limit was 0.06 mg/g.This method was applicable for the determination of borax（boric acid） in puffing foods.