The mixing and segregation characteristics of model wastes such as a wood cylinder (rho(s) = 649 kg/m(3)) and an acrylic sphere (rho(s) = 1,120 kg/m(3)) in a fluidized bed with an inclined distributor are investigated. In this experiment, the plenum chamber was divided into 12 sections so that the an flow rate distribution can be arbitrarily adjusted, and that particle circulation can be induced. After throwing a batch of model wastes, fluidization was kept for a given operation time. Then, the distribution of model wastes in the bed was investigated. Under the present experimental conditions, the model wastes were dispersed into the bed most evenly when the ratio of the higher superficial gas velocity to the lower u(0s)/U-0w was 2 and u(0w) = u(mf).