Abstract: Based on the fact that the rheological characteristic will be changeable with the growing of the water percentage of the water-content oil which is transported through oilfield pipeline networks, experimental studies are made in the level pipe equipment by adding DODE improver into the water-content oil for the purpose of finding out the law that DODE improver affects on the water percentage and viscosity. The result shows that adding DODE improver into water-content oil can make the reverse phase point reducing to 35%~45% and form stable emulsion earlier, and improve the low temperature fluid ability and also reduce the appearance viscosity of the crude oil and get energy consumption obviously.