Abstarct: Utilizing the materials which appear less important and converting them to equipment and materials which are very advantage for human and science, is the issue that possesses remarkable importance. Nowadays, nano science and its branches are considerably important. Carbon nanotubes have been attracted especial attention due to their electrical, mechanical, magnetic, optical and thermal features and applications. CNTs synthesis in a different way such as Chemical Vapor Deposition, Arc Discharge, Laser Ablation. In CNT growth procedure, the point is that mextallic and semiconducting CNTs are simultaneously produced While each of them has especial application separately. Therefore, separation of mextallic from semiconducting CNTs is a necessity and causes to efficient enhancement. Scientist, have been suggested different methods in order to separation of mextallic from semiconducting CNT's including Dielectrophoresis, Agaros gel and separation via boron ions. Various percentages of mextallic and semiconducting CNTs are obtained using each of methods. Researchers want to optimize the results by testing new methods. The optimized value which is reported is 30% mextallic and 70% semiconducting using dielectrophoresis. In this research, for the first time magnetic field is utilized to separate the mextallic from semiconducting CNTs. In this method, separation is performed in two ways including dry and wet that in the later, the solvent containing water, CNT and sodium dodecyl sulfate (SDS). We achieved the percentage of 50% mextallic and 50% semiconducting CNTs using this method. Scanning Electron Microscope and Raman Spectroscopy and four point probe are used to characterize the samples, and results correspond to theory and other results.