Traditional imaging technologies can neither capture ultrafast processes nor get high sensitivity in their imaging processes.This paper aims to build an ultrafast one-dimensional real-time imaging system which is based on the optical mapping and boardening technology.By the use of optical im age amplification,we realize the system with both ultrafast continuous real-time imaging and high s ensitivity.This system makes full use of the dispersive Fourier transform in order to simplify the construction of the system and realize the real-time image processing,while the system is base d on the space-frequency mapping of the spatial grating and the frequency-time mapping of the dispersive fiber.Besides,this paper discuss es not only the system measuring range but also the spatial resolution from both the grating formula and the feat ures of the gratings and other components of the system.We get some ideal experiment al results to verify the system performance.As a result,we get real-time imaging at a frame rate of 20. 9MHz,which is 4orders of magnitude higher than that of the traditional imaging system.Our system measuring range is about 7.0mm,while the spatial resolution can reach as low as 280.