The application of polarization information in the field of communication,navigation and radar systems has been becoming more and more widely,the research on polarized information and its utility is based on the study on polarized state of electromagnetic wave.By starting with the universal elliptical polarized form,two degeneration forms of which: linear polarized form and circular polarized form,are deduced.The decomposition and composition relations of the three types of polarization wave are clearly expoundsed.The quantity relationship of parameters of polarized ellipse with that of electromagnetic wave is given.The relation between polarization direction and electromagnetic phase is proved out,as well as static space polarization.