SUJ2 bearing steel is the capability indicator of manufacturing the highest quality bar/rod products. Not only the reduction in non-metallic inclusions but also the suitable spheroidized microstructure after annealing, including Carbide Size(CS), Carbide Network(CN) and Lamellar Content(LC), are required for subsequent heat treating practice. In order to get the optimum spheroidized annealing pattern under the constraint of the highest available annealing temperature being kept below 780°C, a series of experiments following the L9 design of Taguchi Method are investigated in this study.