Sodium chloride(NaCl) crysals were effectively colored electrolytically with a homemade electrolytic apparatus.Some F,colloid(C) and unknown color centers were produced in the colored crystals.The electrolysis was performed under three kinds of different conditions,and dependency of temperature and voltage on concentration of color center was investigated in detail.Research results show that the concentration of the color center increases with temperature elevating and voltage rising,and the concentrations of the corresponding color cneters at the different parts in the colored crystals are different.