High percentage of Rt. handed people (98%) in Chinese, Taiwan. Lt. handed people was usually forced to use Rt. hand since childhood stage (Corrected Rt. Hand). Corrected Rt. hand people has directional disorientation, easy to miss the road. All the cases receivd C.T. scan study, we analysed the brain lobes and hand usage including Rt or Lt side, particuarly the medical students﹐we had paid more attention on the relationship between brain lobes and usage of hands; Rt or Lt, and also the history of users.