Because crude benzene product contain compounds in the second recovery area of Beiying Coking Plant, affect the appearance chromaticity and transparency, that is the color of the product is cloudy with increase of the storage time is seriously changed to reddish-brown, and the appearance. Through research and analysis, the reasons for the discoloration and turbidity of crude benzene products are mainly caused by the polymerization and oxidation of unsaturated compounds in crude benzene products. Through adjusting operation plan, and the operation plan verifyly the industrial tests ,appearance quality of crude benzene products meets customer requirements and national standards.