This work aimed at investigation of regenerated catalyst flow for fluid catalytic cracking (FCC) regenerator. Computational particle fluid dynamics (CPFD) simulations were performed for demo design of regenerator and its modifications primarily to the air sparger. Commercial CPFD code BARRACUDA was used to simulation. Furthermore, obtained distribution results from CPFD codes were demonstrated by experimental data in case of demo design simulation. The final design was proposed that gives significantly batter temperature distribution than the base case, and hence dramatically decreasing in ratio of over-heated catalyst caused by combustion reaction.