Drop　volume　is　important　for　quantitative　printing,　while　ink　viscosity　has　an　important　influence　on　droplet　volume.　First,　a　nozzle　model　was　proposed　based　on　laminar　flow-level　set　method.　The　ejection　processes　of　droplet　with　different　viscosity　at　different　moments　were　demonstrated,　under　the　condition　that　the　ink　density　is　1.0　g/mL,　the　surface　tension　is　28　mN/m,　and　the　viscosity　is　1-15　mPa•s,　and　the　negative　correlation　between　the　droplet　volume　and　viscosity　of　ink　was　obtained.　Then,　the　droplet　volume　was　quantified　through　the　integration　of　the　level-set　function,　and　the　variation　range　is　58.10-37.29　pL;　and　a　negative　linear　relationship　between　the　volume　of　droplet　and　the　ink　viscosity　was　obtained　by　linear　fitting,　specifically,　＇A=-1.54＇,＇B=60.2＇.　Secondly,　the　printing　experiment　was　carried　out　by　the　printing　of　polythiol　ink　under　the　same　physical　parameters,　and　the　variation　range　of　droplet　volume　was　149.9-92.9　pL,　and　the　specific　fitting　relationship　between　the　droplet　volume　and　the　ink　viscosity　was　still　a　negative　linear　relationship:　＇A＇=-4.12＇,＇B＇=154.71＇,　which　proved　the　simulation　result.　And　the　results　of　simulation　and　experiment　show　that　there　is　a　coefficient　＇h=2.5＇　between　the　linear　function　of　them,　and　coefficient　＇h＇　was　proven　to　be　independent　of　the　type　of　ink,　but　to　be　determined　by　the　inlet　pressure　through　the　further　simulation　research.　This　study　can　help　to　simplify　the　quantitative　printing　process　of　any　type　of　ink　with　a　lower　viscosity.　©　2019,　Science　Press.　All　right　reserved.