Driven by the worldwide demand for polypropylene, propylene production is expected to grow significantly in the next few years. Although steam cracking is the leading source of propylene production, fluid catalytic cracking (FCC) also plays a major role in supply of propylene in most of the world market. ZSM-5 based additive is commonly added to the cracking catalyst in FCC to enhance gasoline octane and LPG olefins production especially propylene. Study has shown that ZSM-5 based additive in the FCC process acts mainly by cracking C6+ gasoline olefins to smaller olefins.  ZSM-5 in the FCC, which has been subjected to severe hydrothermal conditions, is not active enough to crack gasoline paraffins. The gain of gasoline octane results from the combined effects of reducing low octane compounds together with the relative increase in concentration of desirable high octane hydrocarbons (i.e., aromatics and naphthenes). The core of Engelhard's DMS (Distributed Matrix Structures) technology is the unique catalyst pore structure which enhances feed molecule diffusion and provides highly selective zeolitic pre-craking sites along the pore walls. Two commercial FCC catalysts having equivalent total surface area and zeolite rare earth content, one with DMS technology and the other with conventional technology, were studied in a pilot riser testing unit with a commercial brand of high activity ZSM-5 based material. The measured gasoline yields and gasoline PIONA data demonstrate that ZSM-5 free catalyst with DMS technology has the advantages in gasoline yield as well as gasoline olefinicity compared to the conventional catalyst.  ZSM-5 cracking to propylene is olefin limited at high ZSM-5 loading and stronger synergy for propylene production between DMS-based catalyst and ZSM-5 is realized as the ZSM-5 loading is increased.  The high olefinic gasoline generated from DMS-based catalyst also has better gasoline octane.