The book covers various aspects of the theory of semiconductors lattice vibrations, the laws of motion of electrons in a perfect and perturbed periodic fields kinenematicheskoe equation and transport phenomena. We set out the elements of group theory and symmetry of crystals and materials for semiconductor optics. The advantage of the book is the clarity and accessibility of mathematical apparatus: detailed way all the formulas are derived based on the information of mathematics, quantum mechanics and statistical physics programs in the amount of physical faculties of universities. Some mathematical conclusions, more complex and less related to the main text, are given in the annexes. The book is intended for students of physical specialties of universities and technical schools and experimental physicists.