In this paper, the damage of hair and wave shape in process of the dyeing, bleaching, and permanent hair wave are simulated. The virgin hair that do not process the dyeing, bleaching, and permanent hair wave becomes stable in the scale type. On the other hand, the hair that deals with the dyeing, bleaching, and permanent hair wave is heavily damaged in the scale type. It is observed that the higher pH is decided, the higher the hair is damaged because the scale damage in the bleaching hair is more heavily damaged than the dyeing hair. In case of executing the permanent hair wave, the processing of the plaine rinsing becomes less in the scale damage of the hair and better in the wave form. Therefore, it is found that the processing of the plaine rinsing to improve the wave form and to prevent the hair damage is needed.