Abstract: Two alkaline earth metal complexes, \Mg(tabc)_2(H_2O)_4\ (〖STHZ〗1) and \Ca(tabc)(H_2O)_4\ (tabc) (〖STHZ〗2) (Htabc=4-(1-1,2,4-triazolyl)benzoic acid) were synthesized via hydrothermal method and solvent evaporation method, respectively. The complexes were characterized. X-ray single crystal diffractions show that the complexes 〖STHZ〗1 and 〖STHZ〗2 are composed of discrete and one dimensional structure, respectively. The coordination water molecules are hydrogen bonding with the oxygen atoms of carboxylate groups, and furthermore accumulated into 3D and 2D supramolecular structure for 〖STHZ〗1 and 〖STHZ〗2, respectively. The unbounded tabc- ligands in 〖STHZ〗2 connect the 2D layers into 3D supramolecular structure via hydrogen bonding. The solid-state fluorescence spectra of 〖STHZ〗1 and 〖STHZ〗2 show that the wavelength of emission peaks are hypsochromic shift compared to that of the ligand. The TG data indicate that the free tabc- ligands in 〖STHZ〗2 can obviously stabilize the structure. CCDC numbers are 1460791 (〖STHZ〗1) and 1460792 (〖STHZ〗2).