Abstract: The amount of oily water from heavy oil production in Henan oilfield fluctuates greatly,density of oil in oily water is large,and colloid and asphalt contents are high,thus the water quality after treatment cannot meet standards.Several specific measures are presented including control of the di-ameter of oil drops,oil and water density and viscosity,and a new technical process of treatment is designed.The ulti-mate oil content is under10mg/L and the content of me-chanical impurities under5mg/L after the new technical process is applied.