Characterization of ceramic support manufactured by the mixture of spent foundry sands (SFSs) and loess is examined to obtain the optimal conditions of calcination process which is the most important process in manufacturing ceramic supports. SFSs used in this study are furan sand, green sand, and CO₂sand. Ceramic support with SFSs is formed by a extruder. Characterization of ceramic support is estimated by bulk density, porosity, compressive strength, and chemical resistance. From particle size analysis, the order of particle size for SFSs is furan sand > green sand > CO₂sand. As increasing elevating temperature time and calcination temperature, porosity in ceramic support with furan sand is almost similar to that with green sand. As increasing elevating temperature time, compressive strength of ceramic support is in order of furan sand > CO₂sand > green sand. As increasing calcination temperature, compressive strength and durability of ceramic support are improved. As increasing calcination temperature, compressive strength and durability of ceramic support are improved to 9 hrs. Porosity of ceramic support is high at 900℃. Hence, it is confirmed that calcination temperature and calcination time can be decided by 900℃ and 9 hrs, respectively.