[en] Formation of three main phases including: CdMoO₄ base solid solutions crystallized in the structural type of scheelite, their formation interval 20% of Ho₂[MoO₄]₃ at 050 deg C; solid solutions with the structure, related to lscheelite, but undergoing a monoclinic distortion and crystallized within 33-48% Ho₂[MoO₄]₃ molar concentration interval; holmium molybdate base solid solutions with the extent area of up to 8% of CdMoO₄, is ascertained in CdMoO₄-Ho₂[MoO₄]₃ system. An equilibrium phase diagram of the system under investigation in proposed