In this work, impact copolymer polypropylene (ICPP) was fractionated into 4 fractions. ICPP and the 4 fractions were studied using Fourier transform infrared and C-13 nuclear magnetic resonance analysis. The results demonstrate that fraction A is ethylene-propylene rubber, fraction B is ethylene-propylene (EP) segmented copolymer, fraction C is ethylene-propylene block copolymer, and fraction D is polypropylene with a few ethylene monomers in the chain. The differences in properties between different impact copolymer polypropylenes should be due to their fractions＇ differences in composition and chain sequence structure.