Customer　relationship　management　(CRM)　attracts　a　lot　of　attention　from　enterprises　all　over　the　world.　By　studying　the　whole　system,　the　paper　presents　the　architecture　of　CRM　system　and　analyzes　the　two　parts　of　the　architecture　based　on　data-mining.　Customers＇　information　is　first　studied　and　then　the　employees＇　information.　At　last　the　relationship　between　them　is　discussed.　The　data-mining　of　the　enterprise＇s　native　information　is　very　important　for　its　decision　and　the　CRM　study　should　include　the　enterprise＇s　native　information　and　should　compare　their　native　and　exterior　information.　The　example　is　discussed　in　the　data-mining　of　customers＇　information　and　the　employees＇　information.