In　order　to　improve　the　quality　of　colorful　offset　printing　and　know　the　process　of　ink　transferring,　this　paper　adopts　the　method　of　theoretical　analysis　and　experiment,　the　velocity　and　pressure　of　the　ink　flow　field　are　analyzed　when　the　rubber　roller　deforms　and　the　two　rollers　rotate,　and　the　effective　ink　layer　thickness　is　extracted,　then　the　ink　transferring　rate　can　be　got.　The　rubber　roller＇s　deformation　and　ink　transferring　rate　under　different　conditions　are　got,　and　factors,　such　as　rotation　velocity,　deformation　of　rubber　roller,　ink　layer　thickness　between　two　rollers,　which　affect　the　ink　flow　and　transferring　rate　are　analyzed.