Methods for the hydrocarbon feed to the catalytic conversion, the hydrocarbon feedstock by contacting the catalyst system, a process of performing catalytic cracking reaction in the reactor, as well as fractionating the reaction product from the reactor light olefins include gasoline, diesel oil, heavy oil, and the step of obtaining other saturated hydrocarbons with low molecular weight. The catalyst system, based on the total weight of the catalyst, 1-60 wt% of the zeolite mixture, contains 5 to 99 wt% of the thermotolerant inorganic oxide, and 0-70 wt% of clay. Said zeolite mixture comprises, based on the total weight of said zeolite mixture, 1-75 wt% of phosphorus and the transition metal M in the modified zeolite beta, zeolite having a 25-99 wt% of the MFI structure, and 0-74 It contains% by weight of the large pore zeolite. Expressed as weight percent on the oxide, the composition of phosphorus and the transition metal zeolite beta anhydride modified with M _{is, (0-0.3) Na 2 O ·} (0.5-10) Al 2 O _{3 · (1.3-10) P 2 O} 5 · (0.7-15) M x O y · (64-97) is SiO _2, wherein, M is, Fe, Co, Ni, Cu , mn, is selected from the group consisting of Zn and Sn, x represents the atomic number of M, y represents a number necessary for the oxidation state of M. Methods for the hydrocarbon catalytic conversion of the present invention is to improve the ability to convert hydrocarbons, and the yield of light olefins, in particular realized to increase the yield of propylene.