With　the　application　of　SCADA　(Supervisory　Control　and　Data　Acquisition)　is　becoming　more　and　more　extensive　in　the　national　critical　infrastructure.　At　the　same　time,　compared　with　conventional　control　system,　the　data　communication　of　SCADA　system　becomes　more　diverse　and　complex,　and　the　communication　system　is　more　likely　to　be　attacked,　so　improving　the　level　of　information　security　of　SCADA　system　is　very　important　and　urgent.　However,　the　wide　application　of　DES　has　a　short　key　in　the　world,　which　cannot　meet　the　demand　of　the　current　network　security.　In　this　paper,　ADES　(Advanced　Data　Encryption　Standard)　algorithm　is　proposed　and　implemented　in　the　C++　language,　which　is　based　on　the　deep　research　of　data　encryption　methods　and　DES　algorithm　particularly.　The　method　extends　the　length　of　DES　from　64　bits　to　128　bits.　The　function　of　ADES　algorithm　is　closed　to　SM4　by　experimental　result,　so　the　ADES　can　well　meet　the　requirement　of　data　transmission　security.　©　2019　IEEE.