Abstract: In order to apply the gas-rotation-plate (GRP) droplet separator to dust separation, the following experiments were carried out: a GRP separator was installed near the top of a 300 fluidized bed, the dust used was PVCR and Al2O3 powders and Fe2O3 dust collected from an electric precipitator. The efficiency of dust separation was higher than 99% for the dust through 200 mesh, while the pressure drop was lower than 10 mm H2O, at air velocities ranging from 0.4 to 1.7m/s. It was also good for the separation of Fe2O3 dust through 200 mesh. Sealing device was unnecessary for the dipleg for dust returning to the lean phase or dense phase of the bed, owing to the low pressure drop and structural characteristics of the separator. The GRP separator has been used for the flue gas from the furnace of a 6.5-ton boiler. About 1 ton of coal dust was recovered per day. The relationship between the critical particle diameter and the structure parameters was derived under some assumptions.