Abstract: To improve the gas-solid velocity in the riser reactor and ring-core characteristics of radial distribution of particle concentration, Eulerian two-phase flow model and SIMPLE algorithms are used to analyze the flow field and concentration field for the riser with three different types of ring baffles and compared with the traditional riser. As shown from calculation results, installed ring baffles can not reduce axial back-mixing of gas-solid in the riser and even cause an obvious vortex in some specific structures, however, installed ring baffles in the riser can greatly improve the radial velocity distribution and concentration distribution of gas-solid flow so that the flow in the main section is closer to plug flow state to facilitate control of the reaction. Rational design of ring baffle structure and position in the riser can improve flow conditions of gas-solid to control and optimize reaction time.