Gasoline samples resulting from cottonseed oil catalytic cracking on a fixed-fluidized bed were analyzed to give the carbon number distribution of paraffinic, isoparaffinic, olefinic, naphthenic, and aromatic components using PIONA analysis. Cottonseed oil catalytic cracking was studied on a fixed-fluidized bed reactor under atmospheric pressure in order to analyze temperature influence on the gasoline composition. Cracking temperatures were from 430 to 490 degrees C. Three productions were obtained after reaction condensation: solid (coke), liquid (water and oils), and gas (light hydrocarbons, H-2, CO, and CO2). The product distribution and composition were studied as a function of the catalytic cracking parameters. Bio-gasoline composition is similar to FCC gasoline, a diesel-like distillation range almost consistent with petroleum diesel; these can be used as fuel or fuel additives.