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Carbon nanotubes are considered as novel materials which have ultimate applications. These nanotubes have been dispersed in many materials for exploring its new interesting properties. Polymethyl methacrylate (PMMA) is one of the most studied polymers due to its stability, low-cost, low optical loss in the visible spectrum, high scratch hardness and low glass temperature. This paper investigates the optical and thermal properties of CNTs PMMA composite films. These composite films are prepared using casting method by dissolving PMMA in acetone with the ratio 1:27 by which clear films are obtained. The absorption spectra and melting point of the films are determined. Results show that the crystallization process is largely dependent on the concentration of the CNT but not necessarily to have direct proportionality.