Abstract: Petroleum coke plays an important role in graphite manufacture, metal smelting, chemical industry and other fields. Coking process is the only way to produce petroleum coke. For a long time, the quality of petroleum coke produced by delayed coking devices in PetroChina Urumqi Petrochemical Company could only meet 3A, 3B and lower quality standards, which led to poor competitive ability and low profit ratio. Correlated analysis showed that the key factor restricting quality improvement was the higher volatile content. Combined with the actual production, some constructive suggestions were put forward, such as increasing inlet temperature and purge steam quantity of coke drum, reducing the amount of recycled oily sludge, etc. Practice showed that the scheme was practical, reliable and feasible. The volatile of petroleum coke could be reduced to below 12%, which met grade 2A quality standard. And the output proportion was increased by 58%. Product difference strategy comes true at a lower cost.