Abstract: The sewage existed many problems after being treated in Shinan Sewage Treatment Station, such as high content of suspended matter, unstable oil content, high corrosion rate, serious water quality deterioration along the pipeline, etc. After the transformation of pre-oxidation and related technologies, then reconstruction of some equipments, updating of filter equipment and necessary complement for water disposal reagents. The water quality by treated was improved greatly. After the reformation, various economic and technical indexes have reached advanced level among the similar stations, the water quality coincidence rate is significantly increased, and the quality of the reinjection waste water is greatly improved. The water quality deterioration trend along the pipeline is slowed down and obvious economic and social benefits are gained.