This paper describes a single machine software reconstruction scheme for load internal signal processing based on an anti fuse FPGA.Based on the anti fuse FPGA external expansion RS422 interface,it receives commands from the main control device,while the LVDS interface receives reconstructed data and controls NorFlash read and write,achieving software reconstruction.This design has been applied to a single machine for satellite borne synthetic aperture radar signal processing,achieving software reconstruction in orbit.