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Fluidization characteristics of drops or ice particles in liquid—liquid circulating fluidized bed (LLCFB) for fluid ice production were experimentally studied by means of image gathering and processing. Four typical fluidization characteristics were defined; they were the diffuseness, convergence, adhesion and coalescence of particles. Particles size distributions along the height of LLCFB were obtained. The relativity was revealed between particles fluidization characteristics and fluidization states of LLCFB based on Froude number, Fr and the range of operating parameters combination was discussed which could achieve particulate fluidization states of LLCFB. The results show that the variations of particles fluidization characteristics and sizes distributions are presented by the effect of the height, operating parameters and their combination. The particles diffuseness firstly happened at the bottom of LLCFB, 0.50m, under the influence of particles phase change which further led to the convergence, adhesion and coalescence of particles at the other heights, but the phenomena that larger particles formed due to the coalescence of particles must occur. Fluidization states were estimated by Fr calculation and directly affected by particles fluidization characteristics, its perfect fluidization states and particulate fluidization were mainly appeared at some range of operating parameters, such as smaller volume flow-rate of dispersive liquid and lower velocities and temperature of cycle liquid coolant.