Abstract: The first commercial unit worldwide of heavy feed catalytic pyrolysis process (CPP) was set up and put into operation in June 2009 at Shenyang Chemical Group Shenyang Paraffin and Chemical Company with a capacity of 500 kt/a. This unit is designed for processing paraffinic atmospheric residue feedstock to obtain main products, ethylene and propylene, with cracked naphtha having high light aromatics as by-product. The results of performance test show that using Daqing atmospheric residue feedstock, under ethylene plus propylene operation mode, at a reaction temperature of 610℃ and without recycle of ethane and propane, the yields of ethylene and propylene reach 14.84% and 22.21%, respectively; the aromatics mass fraction of cracked naphtha is 82.46%, which all well meet the design targets. The successful running of this unit opens a novel light olefins and aromatics production route from heavy feedstock, which is also a good example of refining and petrochemical integration.