PP can be included in the cavities of cyclodextrin (CD). The crystalline inclusion complex between β-CD and low molecular weight polypropylene (PP) was obtained and investigated. a-CD and γ-CD did not form crystalline inclusion complexes with PP. The FTIR spectra, TGA, X-ray diffraction spectra were studied, 1H-NMR spectra and 13C CP/MAS NMR spectra were used to characterize the crystalline inclusion complexes.