The heat transfer coefficients between gas and solid particles in a countercurrent gas-solid contactor with regularly arranged baffle plates have been obtained by temperature profiles and from the heat balance equations in consideration of heat loss through the wall. A critical point of gas flow rate, G(1d), has been observed for the present countercurrent gas-solid contactor. At G(1d) (loading point) the holdup of solid particles begins to increase with increasing gas flow rate, G. The heat transfer coefficient between gas and particles, h, shows a broad maximum at G(1d), but the volumetric heat transfer coefficient, ha(p), where a(p) is the specific surface area of particles, increases with increasing G in the present range of G.