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].