Introduction
Taking Fe, Co, Ni pure metals and Ag-Cu, Ti-Al, Au-Cu systems as examples, the systematic science of alloys has been presented in the monograph , which includes six levels: separated theory of potential energies and volumes for characteristic atoms, valence bond theory of characteristic crystals, separated theory of thermodynamic properties for characteristic crystals, characteristic atom arrangement crystallography of alloy phases, thermodynamics of mixed characteristic crystals for alloy phases and comprehensive theory of mixed characteristic crystals for phase transformation, phase equilibrium and phase diagrams. It may be available for reference to graduates, teachers and researchers.