The invention belongs to the field of terminal display, and particularly relates to a method for the mapping between PPI display pixels and echo information. The method of the invention simplifies a mapping relationship between echo data and screen pixels, obtains a mapping relationship between display pixel points and the azimuth and a relationship between the display pixel points and the distance respectively according to a PPI display mode and a display range, and ensures that each display pixel point has a corresponding distance unit. The method of the invention is clear and logical, has asmall calculation amount and an obvious effect, simplifies the redundant calculation steps, and is beneficial to implementation in engineering.