Developing new cost effective process for production of propylene and ethylene is great significance to maintain sustainable development of petrochemical industry. SINOPEC SRIPT has developed a process that allows high selective production of propylene and ethylene by conversion of low value C4/C5 olefins from methanol to olefins, crackers and refineries. The OCC (Olefins Catalytic Cracking) process features fixed-bed adiabatic reactors operating at temperatures 500-600℃ and pressures <0.5MPa. The OCC process utilizes a tailor made full-crystalline ZSM-5 catalyst, by re-crystallizing the shaped binder/zeolite body, the binders were converted into zeolitic phase, forming full-zeolitic monolithic catalysts. The full-crystalline ZSM-5 catalyst showed low hydrogen transfer index, and exhibited higher selectivity, catalytic activity in OCC. The full-crystalline ZSM-5 catalyst as well as OCC process, have commercialized in many plants, the yield of propylene and ethylene during the performance test is over 80%.