A single cantilever slant slat was installed in a cold-model fluidized bed of fine particles with a square cross section. The dynamic force on it during the operation of fluidized bed was measured by a dynamic stress meter. Meanwhile, the dynamic pressures in the bed were also measured by pressure transducers. The main influential factors considered were superficial gas velocity, installation height above the gas distributor and inclination angle of the slat. The results indicated that the main energy of dynamic stress on the slat dropped in the frequency range of 0~50 Hz. There was a maximum root mean square (RMS) of the dynamic stress at a superficial gas velocity of 0.5~0.6 m/s, which was near the transitional point between the bubbling and turbulent flow regimes. Along the height of dense bed, the RMS of stress was found to be lower when the slat was installed in the middle section of bed. At different inclination angles, there were minimal values of the stress RMS occurring at 15o, 45o and 60o.