Using differential thermal analysis, X-ray diffraction analysis and composite phase diagrams, the most probable form of the polythermal section Ag2/3Zn1/3-Te of the ternary system Ag-Zn-Te has been deduced. It was found to be non-quasi-binary with 14 phase fields and four isotherms of the non-variant equilibria. It is suggested that a phase with composition Ag2ZnTe2, stable at temperatures above 515 degrees C, is formed.