The principle,structure and implementation of real-time image transmission system of scanning infrared focal plane array(IRFPA)were discussed.Aiming at the requirements of system,a infrared image transmission system based on FPGA was proposed,which was also realized by using optical fiber transmission technology and USB protocols.The scheme has realized real-time transmission of scanning IRFPA image and dual-mode display,and this lays a foundation for the further image fusion and target detection.