Under　the　micro-scale　condition,　feature　size　of　the　channel　is　one　of　the　main　factors　influencing　the　fluid　flow　characteristics.　In　printing　process,　ink　thickness　in　the　extrusion　zone　formed　by　two　ink　rollers　may　reach　micron　scale.　Compared　with　macroscopic　fluid,　the　velocity　field　and　the　pressure　field　of　fluid　may　change　when　the　feature　size　of　fluid　channel　reaches　micron　scale.　In　order　to　control　printing　quality,　it　is　necessary　to　research　the　influence　of　feature　size　on　ink　flow　characteristics　in　micro　scale.　This　paper　analyzes　it　in　theory,　and　then　numerical　simulation　of　an　ink　flow　model　with　different　feature　sizes　is　carried　out　in　no　slip　condition.　The　influence　of　the　feature　size　on　the　ink　flow　characteristics　and　the　wall　shear　force　are　obtained.　Besides,　the　ink　flow　model　with　different　feature　sizes　is　simulated　numerically　in　slip　condition,　and　the　influence　of　feature　size　on　ink　flow　characteristics　is　obtained.　Finally,　by　comparing　and　analyzing　the　above　results,　it　can　be　concluded　that　both　the　ink　velocity　and　pressure　at　the　inlet　of　the　extrusion　zone　are　inversely　proportional　to　the　feature　sizes　whether　in　slip　condition　or　not.　And　the　ink　velocity　in　slip　condition　is　larger　than　that　without　slip,　the　pressure　at　the　inlet　of　the　extrusion　zone　is　less　than　that　in　no　slip　condition.　Within　the　micro-scale　range,　the　ink　velocity　difference　between　the　two　conditions　cannot　be　ignored.　Therefore,　it　is　necessary　to　consider　slip　when　analyzing　the　influence　of　feature　size　of　micro-scale　channel　on　ink　flow　characteristics.　Copyright　©　by　HIGH　TECHNOLOGY　LETTERS　PRESS.