From experiment,the infrared portion of the electromagnetic spectrum is usually divided into three regions infrared named for their relation to the visible spectrum. The higher-energy near-IR can excite overtone or harmonic vibrations. The mid-infrared may be used to study the fundamental vibrations and associated rotational-vibrational structure. The far-infrared lying adjacent to the microwave region, has low energy and may be used for rotational spectroscopy. To explore the applications of the Fourier Transform Infrared spectroscopy in the field of materials science. After the experiment, students should be able to identify the functional groups existing in the films.