Abstract: Iron ions in the oil field wastewater have great influence on the oil field production, such as changing the wastewater quality, corroding the water-injection pipe network, polluting and blocking the formation, etc. In order to solve the impact of iron ions, a series of researches about the iron ions stability are carried out. Based on many field investigations, sampling and lab tests, the composite of iron ions stabilizer has been developed. Better water quality stability effect is gained by field application on Xianhe wastewater.