Abstract: The influent at heavy oil wastewater treatment station in Baizhong 7 well block was known with high oil content, high emulsification degree, high TSS, high temperature, and therefore increasing difficulties for treatment. Combining the wastewater characteristics and application of the water treatment chemicals, this study screened the treatment processes in laboratory tests and finally identified the process as follow: gravity driven oil-water separation/coagulating sedimentation/filtration. During the process design, novel techniques such as water-level regulator to adjust the effluent water, micro-vortex mixer, small-spaced inclined plate separator, and constant-friction perforated pipe were applied to improve the coagulating sedimentation tank design and enhance the purification efficiency. In this study, domestic advanced technology, namely "micro-vortex based heavy oil wastewater treatment technology " were developed to ensure the treated wastewater meeting the injection and boiler make-up requirement.