Automatic　color　measurement　and　control　is　a　key　technology　of　offset　printing　machines.　It　can　improve　the　efficiency　and　quality　of　printing　well.　On　the　basis　of　the　analysis　of　traditional　color　measurement　and　control　method,　the　workflow,　construction,　and　structure　of　the　automatic　color　measurement　and　control　system　are　determined.　The　key　part　of　the　system,　including　measurement　system　and　control　system　are　discussed　in　detail.　The　measurement　system　consists　of　densitometers,　technique　database　and　ink　to　color　conversion　algorithm　module.　And　the　control　system　consists　of　Direct　Digital　Control　(DDC)　system,　ink　key　integrated　control　module,　and　ink　key　control　panel.　The　JDF　specification　based　automatic　color　measurement　and　control　system　workflow　is　established.　Through　the　test　and　application　to　one　domestic　offset　printing　machine,　the　efficiency　of　the　system　is　validated.