The present work was concerned with study of the blending ratio effect on the optical properties of the polymer systems involved Poly(vinyl chloride) (PVC), Polystyrene (PS), Polymethylmethacrylate (PMMA)], binary blends PS/PMMA, PVC/PMMA, PVC/PS] and ternary blends PVC/PS/PMMA] at different concentrations. Also this work was concerned with study the effect of heat treatment of optical properties of polymer system involved PVC/PS/PMMA] and binary blend with ratios, 50 %PS/50%PMMA, 50% PMMA/ 50% PVC and 50% PS /50% PVC].