Image　fusion　information　extracted　from　multiple　images　which　is　more　accurate　and　reliable　than　that　from　just　a　single　image.　Since　various　images　contain　different　information　aspects　of　the　measured　parts,　and　comprehensive　information　can　be　obtained　by　integrating　them　together.　Image　fusion　is　a　main　branch　of　the　application　of　data　fusion　technology.　At　present,　it　was　widely　used　in　computer　vision　technology,　remote　sensing,　robot　vision,　medical　image　processing　and　military　field.　This　paper　mainly　presents　image　fusion＇s　contents,　research　methods,　and　the　status　quo　at　home　and　abroad,　and　analyzes　the　development　trend.　©　2009　Copyright　SPIE　-　The　International　Society　for　Optical　Engineering.