Carbon electrode materials for electrolyte flow type batteries, zinc-chlorine, zincbromine, and iron-chromium redox flow batteries, have been characterized by SEM observation, X-ray diffraction, and micro Raman spectroscopy. Most of the electrode materials characterized are same materials used in the practical batteries which have shown excellent performance. It is found that SEM is favorable to observe textures of the electrode materials. X-ray diffraction is able to imform macroscopic or average crystalline structures, and micro Raman spectroscopy can distinguish the crystalline structure of the surface from that of the bulk of the electrode materials, in order to evaluate the electrode performances.