This work is on the thermal decomposition of ammonium perchlorate activated by addition of commercialMagnesium oxide (MgO) nanoparticles. MgO nanoparticles were characterized by X-ray Diffraction (XRD) and Transition Electron Microscope (TEM) which shows an average nanoparticles diameter of 24 and 20nm, respectively. Also, TEM image shows that the MgO nanoparticles have a polyhedral shape. Furthermore, the catalytic properties of the MgOnanoparticleson the thermal decomposition of ammonium perchlorate (AP) were evaluated by Thermo-Gravimetric Analysisand Differential Scanning Calorimeter(TGA/DSC). This method showed in presence of 1, 2, 3 and 4 wt% of MgOnanoparticles,the thermal decomposition temperature of AP decreased by 102.42, 110.52, 116.47 and 121.96C, respectively. Also, results imply that theheat decomposition of AP was increased by 420.64, 637.18, 647.69 and 821.33J/g in the presence of 1, 2, 3 and 4 wt% of MgOnanoparticles, respectively. The kinetics of the thermal decomposition of AP and catalyzed AP have also been evaluated using model fitting method.