The book elucidated the scientific viewpoints and experimental works of authors about energetic particles. By means of Fractal Theory, the authors clearly disclosed the relationship between micron morphology (such as particle size, size distribution, and particle surface) of energetics and their safety. The most important contribution of these works lay in making the micron morphology of energetics numerical, by which the values of complexity about particle size distribution and particle surface were related to the properties of thermolysis and sensitivities of energetic particles. Hence, we got a further understanding about the change of safety with the change of micron morphology of energetic particles.