A new approach to study of micro texture and structure of graphite intercalation compounds (GICs) is shown using high resolution transmission electron microscopy (TEM) combined with image analysis and fuzzy reasoning. As a result of application of the frequency analysis using 2-dimensional (2D) fast Fourier transform (FFT) to the CuCl2-GICs, a characteristic power spectrum pattern called streak, which is similar to an electron diffraction pattern, is obtained. The images correspond to the specific frequencies are reconstructed by 2D inverse FFT (IFFT). Then the stage structure of CuCl2-GICs is investigated.