Abstract: The produced water from Baolang oilfield is very complex,with high iron-content,bearing with H₂S which is very corrosive,and the treatment temperature on produced water is low.Therefore,it is very difficult to reach the water quality standard for reinjection of produced water and direct discharge of produced water.To solve this problem,a new technique for treatment of the produced water with high iron content from Baolang Oilfield has been studied.Through treatment with this technique,the water quality has been improved greatly at the temperature of 25℃ and oxidizing agent of 125 mg/L,with obvious effects of iron removal and sulfur removal and a better control on corrosion of produced water.By sustainable and comprehensive treatment of produced water with this technique,the corrosion rate of injected water has been controlled effectively in Baolang oilfield,and the water quality has reached A3 standard.This technique has been used up to now with excellent operation result.