Five solvates, [CdBr ₂(DMF)] _n, [CdBr ₂(DMA)] _n, [CdI ²(DMF)] ⁿ, [Cd(DMF) ₆][Cd ₂I ₆], and {[Cd(DMA) ₆][Cd ₅I ₁₂] _n} _m, were isolated from the ternary systems CdX ₂–L–H ₂O (X = Br, I; L = N,N-dimethylacetamide, N,N-dimethylformamide) and characterized by the X-ray single crystal analysis. The structures of the first three solvates is similar to each other in structures and represent a one-dimensional polymer chain, the fourth solvate has the discrete structure containing [Cd(DMF) ₆] ²⁺ and [Cd ₂I ₆] ^2– ions, and the fifth solvate contains discrete [Cd(DMA) ₆] ²⁺ cations and the polymer anionic fragment [Cd ₅I ₁₂] _n ^2n–.