The relative viscosity measurements have been reported to explain structural interactions of sodium halides and potassium halides (0.125M - 3M) in aqueous thioacetamide solutions at different temperatures. The structural aspects of the alkali halide solutions have been interpreted by the ionic molar volume (V±), ionic B-coefficients (B±) and hydration number of ions (nB). The change in these data is attributed to the structure making and structure breaking extent of various ions (Na+ , K+, Cl-, Br- and I-) present in the aqueous thioacetamide solution.