Abstract: The development history of a series of processes for producing of light olefins on the basis of heavy oil as feed and extended technology of FCC developed by SINOPEC Research Institute of Petroleum Processing are reviewed. The differences between these processes to FCC lie on the new configuration of process equipment and specially formulated catalyst. The major processes include as follows: Deep Catalytic Cracking (DCC) for propylene production intentionally， Catalytic Pyrolysis Process (CPP) for ethylene and propylene on purpose， Maximizing Gaseous olefins and Gasoline(MGG) for high yield of value-added products， Atmospheric Residue for Gaseous olefin and Gasoline(ARGG) for heavier paraffinic feed， Maximizing Gaseous olefins and Diesel fuel (MGD) for occasional fuel market change for more diesel， and Maximizing Iso-Olefins (MIO)for chemicals， Maximizing Catalytic Propylene (MCP) technology by selective catalytic cracking， Enhanced DCC (DCC plus) technology， and novel deep catalytic cracking technology for Resid to Chemicals(RTC). The progress of the development and industrial application of these processes are introduced and forecasted, which can provide a reference for the transformation from oil refining to chemical industry.

Key words: heavy oil, catalytic cracking, ethylene, propylene, Liquefied petroleum gas, gasoline, diesel