[en] The constitutional diagram of the CdMoO₄-Cd₂(MoO₄)₃ system has been plotted using statistical and dynamic methods as well as a complex of instrumental analysis procedures. Three major phases have been found to occur in the systems, viz.: CdMoO₄ based solid solutions that crystallize in the range from 0 to 25 mol.percent of Cd₂(MoO₄)₃ and pass in transit the two-phase narrow region becoming then solid solutions having a distorted scheelite structure and existing in concentrations from 40 to 65 mol.% of Cd₂(MoO₄)₃. The entire range, in which the Cd₂(MoO₄)₃ solid solutions can exist, amounts to less than 5 mol.%. Certain crystallochemical constants of the phases that occur in the system have been determined