Bootloader　is　an　important　part　of　ARM　embedded　system.　The　realization　of　Bootloader　is　closely　related　with　hardware.　This　paper　gives　a　brief　introduction　to　S3C2440　development　board　and　its　starting　mode.　Mainly　introduces　the　initialization　of　the　each　function　module　in　S3C2440　during　the　system　startup,　and　scheme　out　the　Simplified　Bootloader　for　S3C2440.　After　testing,　This　Bootloader　has　good　practicability　and　portability.