This research focuses on the CCFL which is the light source of the backlight module. Life of electrode will be researched on the condition of low pressure of filled gas and high current. In order to investigate sputtering condition of electrode, we use X-ray to detect it and quantify the comsuption of that. After understanding how pressure of filled gas affected electrode, the method of current density is decided to estimate the life of electrode on the same material of that. At last , new alloy of Ni is estimated again to check if it’s better than pure-Ni electrode or not.