Abstract: Different samples of polymeric thin films of Poly Styrene (PS) mixed with DCM laser dye at fixed concentration were synthesized by casting method under varied annealing temperatures range of (25, 50, 75°C). The effect of varying annealing temperature on the some physical properties of these polymeric films has been studied. The optical electronic energy gaps of the films were evaluated from absorption spectra and studying the temperature varying on these energy gaps.