This paper discusses some information about the cosmic microwave background radiation (CMB)’s polarization and the study of the early state of the universe. The early state of the universe. The heat emitted after the Big Bang is called the CMB, and the CMB polarization carries important information about the shape and structure of the early universe and is an important means to study the state of the early universe. This paper first introduces the background knowledge of CMB, and then discusses the theoretical framework of inflation theory, including some important concepts and different models of inflation theory, specific CMB polarization modes, and some specific techniques for analyzing CMB polarization data. Next, the paper discusses the observational evidence for the CMB, including important experiments such as WMAP, Planck, and BICEP, and their support for inflation theory. The paper also introduces the data analysis method of CMB polarization.
