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Studies show that the carbon nanotubes (CNTs) serve as hydrogen diffusion channels, when used with magnesium hydride. The hydrogen sorption study, of a MgH 2 and 5wt% of multiwalled carbon nanotubes mixture, was the main purpose of this work. The samples were analyzed by means of X-ray diffraction (XRD) and also studied in a differential scanning calorimeter (DSC). The carbon nanotubes, that were ball milled during 20 min to the MgH 2, were observed in the scanning electron microscopy (SEM) images. The mixture of MgH 2 -CNT turned out to enhance the hydrogen sorption when compared to pure MgH 2 and in 5 min it desorbed around 5 wt% of hydrogen, at 350 o C and 0.1 bar.