This book introduced the author's studies about fabrication, performance, and reaction mechanism of nanometer materials. The contents included: Thermite Reactions of Al/Cu Nanocomposites with WO3, Thermite Reactions of Al/Ni Nanocomposites with SnO2, Impact-Initiation: Nanostructure Al-Mg Alloys with Fe2O3, Reactions Mechanism: Aluminum/Iron-Oxide Nanocomposites, Fabrication and Performance of Nanometer HNIW, Fabrication and Performance of Nanometer HMX, Thermodynamics and Kinetics of thermolysis of Nanometer Nitramines, Mechanism of Decrease of Sensitivities for Nanometer RDX.