Abstract: Scatter artifacts in cone beam CT(CBCT) degrades image quality seriously, which limits the development and application of CBCT. Researchers have reviewed scatter suppression or correction methods at home and abroad. However, a few new technologies have appeared along with the advancement of scatter suppression methods. This paper analyses the effects of X-ray scattering to CT imaging and summarizes general scatter suppression methods. Also, the scatter correction framework is combed, in which the projection compensation technique and common scatter estimation methods are introduced particularly. Problems in scatter correction are concluded, in which the magnification of noises in scatter correction is emphasized. It provides use for reference to the research and development in scatter suppression.