The course “Phase equilibrium in the silicate systems” is aimed the main knowledgments about the phase equilibrium in the mono- two- and thricomponent oxide and non oxide systems, which are a base for the obtaining of the different kind of material compositions: glassy, glass – crystal, ceramic, composite. In this course it will be discuss the main kinds of the phase diagrams, kind of the depict theoretical and experimental build. Triangulation method for the formation of the some equilibrium phases. Kwasibinary separation, different kind of polythermal and isothermal section. It will be discuss the phase diagrams characteristics of the silicate, borate, phosphate, aluminate, titanium, ferrite, zirconium bases of the some salt water and mixed systems with participation of the non oxide compounds. The presence of eutectic, periteutectic, different kind of distectic, formation of the non stoichiometrical phase, synthetic and monoteutectic transformation. Metastable state of the definite polymorph forms of the silicate phases, which are interesting for the practice. Each problems from the lecture course follow the suitable consistency: historical review of the phase diagrams, recent data, phase equilibrium analyzes in the system at the concentration and temperature changing, methastable phases, microstructure, development and connection with the properties, application of the phase diagrams for the synthesis and diagnostic of the materials.