Abstract: To increase the throughput of a coking unit, a series of technical revamping including heating furnace and process flow, was carried out to shorten the coking cycle. After revamping the coking cycle is shortened from 24 h to 18 h, the throughput is increased from 1.0 Mt/a to 1.25 Mt/a, recycle ratio reduces from 0.25 to 0.15 and operation of flexibly adjusting recycle ratio is realized. The unit is operating stably with slightly reducing dry gas yield and increasing light oil yield, and the total energy consumption of the unit is reduced, an energy saving of 2.66×108 MJ/a is achieved.