It is well known that there are four forms for oil in produced wastewater from polymer flooding, including oil slick, dispersed oil, emulsified oil and soluble oil. Not only the content of emulsified oil but also the water stability would increase because of the soluble polymer used as flooding agent. In the article, the water produced from polymer flooding was studied, and the oily ratio of different forms with different polymer concentrations was determined. It was found that the content of the emulsified oil was 90 percent of in the simulated wastewater containing polymer, which was the key object for water treatment of polymer flooding. In the addition, the emulsified oil of the simulated wastewater, exhibited obviously increased when the concentration of polymer in water was above 50 mg/L, compared to that of simulated wastewater without polymer. Meanwhile, the emulsified oil of the produced wastewater containing polymer of about 50 mg/L was higher than that of the simulated wastewater; hence, the former was more stable and more difficult to be treated with than the latter.