1IntroductionIn fact, ever since the commercialization of PE and PP in the 1950s, the functionalization of polyolefins has been a very interesting research subject attracting attentions from both academic and industrial communities. The so-called polyolefin functionalization is explained as introducing polar functional groups into polyolefins. With the precondition of maintaining the desired properties of polyolefins, polyolefin functionalization confers reactivity to polyolefins, improving adhesion and compatibility between polyolefins and other materials, such as pigments, paints, glass fibers, metals, carbon black, and most polymers. The application of polyolefins after functionalization can be extended to such areas that even involve catalyst supporting, medicament, photoelectron material, biomaterial, photo material, and environmental protection, which have never been previously accessed by polyolefins.