Abstract: The inner flow field in cyclone fluidized bed with single swirler and double swirler structure was analyzed. The Eulerian multiphase flow model was used to analyze the distribution state and velocity distribution of the particles, and the axial climbing characteristics and dead zone distribution of the particle clusters with two structures were compared and observed. The results showed that the fluidization degree of the double swirler structure was better, and the particle distribution was more uniform and stable. The Fluent coupled discrete element analysis software EDEM was used to analyze the particle motion characteristics of two structures. It was found that the axial motion of the particles alternated between acceleration and deceleration. The fluidized bed with double swirler structure had better fluidization performance and could make particles reach stable state faster.