When more and more heavy oil is heavily used for producing propylene, the Deep Catalytic Cracking (DCC) technology plays a very important role. At present, there are 6 sets of DCC facilities under operation in China. The technology is also licensed to foreign companies. It was firstly exported to Thailand in 1994. It is the milestone of exporting big refinery complete set. A facility with a production capacity of 750,000 tons/year was established in Rayong in Thailand. After that, the technology is licensed to Saudi Arabia and a facility with a production capacity of 4.5 million tons/year was set up in Rabigh. With the progressing application of the DCC technology, the DCC catalyst will show its potential and bright future.