Carbon nanotube is the form of carbon element that show spectacular electrical and optical properties. They are in the form of thin empty cylinders. Elastic modulus of carbon nanotubes is nearly 1 TPa (it is known that elastic modulus of diamond is 1,2 TPa). It has higher strength than steel at the same weight. Another significant property of carbon nanotube is carrying electricity so that it carries 1000 times more than copper and silver do. Moreover, at high tempreatures it preserves its unique properties for more with respect to other materials. Because of these great characteristics, it replaces many materials in the industry.