To apply a pulsated fluidized bed, where fluidizing gas is regulated periodically, to drying, catalytic reaction and heat exchanging processes, enhancements of heat transfer rate and particle mixing are needed. It is considered that mass and heat transfer rates in the radial direction in fluidized beds can be promoted by passing large bubbles through the riser due to pulsating operation. Pressure drop measurement and visual observation in the pulsated fluidized bed apparatus under a large bubbling fluidization mode are carried out. The results are compared with those of normal fluidization with continuous gas flow to investigate the hydrodynamic characteristics in the pulsated fluidized bed. Peculiar fluidizing conditions for the pulsated fluidized bed, such as the existence of larger bubbles and higher pressure drops comparing with normal fluidized bed, are observed in cases where off-period duration of fluidizing gas is regulated over bubble transit time through the riser. This is considered to be due to static bed formation during the off-period of fluidizing gas.