PROBLEM TO BE SOLVED: To provide an excellent method for removing tar in a fluidized bed furnace. SOLUTION: The method for removing tar in the fluid bed furnace is, in a system for obtaining a gas generated by gasifying, heat decomposing or partially oxidizing a raw material in a fluidized bed furnace, to adsorb/decompose tar generated from the raw material by using a fluidized catalytic cracking catalyst, a fluidized catalytic cracking balanced catalyst, silica-alumina-based particles or alumina-based particles produced by oil-immersion granulation method and/or to burn the tar by adhering to the fluidized catalytic cracking catalyst, the fluidized catalytic cracking equilibrium catalyst, the silica-alumina-based particles or the alumina-based particles produced by the oil-immersion granulation method. COPYRIGHT: (C)2006,JPO&NCIPI