This study was undertaken to finish the design of the adequate preadjusted bracket in Korean. The labio-lingual & bucco-lingual width of tooth & in-and-out of the bracket base was studied in normal occlusion of 17 males & 17 females. The following results were obtained. 1. The in-and-outs of the bracket base in Korean were obtained (table 2). 2. The in-and-outs of the premolar & molar were no significant due to variation according to arch wire shape in clinical practice, so the more adjustment of arch wire was required. 3. The more amount of offset was required at lateral-canine offset than at central-lateral offset in 1st order bending, due to difference of the in-and-out. 4. The degrees of the anti-rotation in molar were obtained (table 3).