Abstract:An ultrasonic assisted circulation extraction technology for okra flavonoid was optimized by orthogonal testing.The effects of temperature，pH and metal ions on the stability of okra flavonoid were studied.The results show that the optimum process parameters were ultrasonic power of 400 W，solid-liquid ratio of 1∶25（g/mL），extraction time of 45 min，and extraction temperature of 55 ℃ .Under these conditions，the yield of okra flavonoid was 4.62%.The flavonoid exhibited good heat tolerance in solution.The chemical structure remains unchanged below 50℃.The stability of okra flavonoids was good in acid；When the concentration of metal ions Na+，K+，and Ca2+was lower than 0.08%，it had no significant effect on the stability of the okra flavonoid，whereas Fe3+and Cu2+significantly altered flavonoid stability.