A new cadmium coordination polymer, formulated as [Cd(L)(phen)](n), were prepared by hydrothermal reactions based on 3,4-dibromothiophene-2,5-dicarboxylic acid (H2L) and 1,10-phenanthroline (phen) mixed organic linkers. In the complex, adjacent Cd2+ ions are linked by L2- anions to form a one-dimensional (1D) [CdL](n) chain with [Cd-2(COO)(2)] as the secondary building unit (SBU). These adjacent chains are further stacked together by direct C-BrBr halogen bonds interactions, generating a two-dimensional (2D) supramolecular structure. From the viewpoint of topology, the 2D supramolecular network can be rationalized to a 3,4-connected 3,4L13 net with {4.6(2)}(2){4(2).6(2).8(2)} topology.