Fluidized bed technology is widely used in chemical industries. The introduction of pulsating energy into a traditional fluidized bed can effectively reduce the generation of bubbles and improve the fluidization quality. The accuracy of gas-solid distributions has a significant influence on the density control of fluidized beds. Here, a gas-solid distribution model and bed expansion prediction model were established with the wake taken as the intermediate phase to make up for the lack of a gas-solid distribution theory in a pulsed fluidized bed. The correlation coefficient of the theoretical model was validated using data obtained from collapse experiments. The linear fitting correlation between the bed expansion height H-(p) and correction coefficient Y is quite good. The error of the modified model of the bed expansion ratio was theoretical guidance for industrial applications of pulsed fluidized beds.