Abstract: The low recycle ratio operation has been adopted on delayed coking unit in SINOPEC Luoyang Company recently. The result shows that the liquid yield and unit throughput were increased by 3.57 and 30 percentage points respectively, and energy consumption was reduced by 41.03%. Meanwhile several measures have been provided to the problems resulted from the lower recycle ratio, such as the coking in furnace pipes and bottom of fractionator.