In this study, we invested the effect of Reynoutria elliptica on hair surface damages. The possibility of colors from the natural plant extract is limitless. However, it is difficult to vary the utilization possibilities of colors to increase the value of natural coloring as well as other disadvantages of easy decomposing, and the inability to collect them year-round. However, the natural coloring is harmless to human body, can minimize the hair damages, and can bring out a deeper and more subtle colors than the chemical dyes, which is used as the natural hair dye products with increasing use to replace the chemical hair dyes with many side effects. Therefore, the natural coloring of Reynoutria elliptica is extracted to be used in hair dye to examine the damages to scalp as an attempt to suggest the possibility of natural hair dye products and also expand the utilization possibilities of natural extracts. When observing the scales on the hair surface with electron microscope for comparison with the hair before dyeing, dyeing with reynoutria dyeing showed shiny characteristics after pigmentation on the hair but other damaged areas were healthy without any uniqueness, which has confirmed the potentialities of the natural herbal extracts.