Characteristics of solids feeding to a fluidized bed by pneumatic transport were studied experimentally. Sand, bituminous coal and anthracite particles were used as feed material. Studied variables were orifice ID, length and ID of conveying line, flow rate and pressure of transport air, and "hopper ΔP". It was experimentally proved that feeding rate of solid particles can be controlled by manipulating transport air rate and "hopperΔP", without use of any moving machinery. Design procedures for the pneumatic transport of solid particles to a fluidized bed is suggested as well. We also found that the effect of pressure of transport air can be estimated by considering kinetic energy only.