Reliable　thin　film　encapsulation　is　of　great　importance　in　the　development　of　organic　light　emitting　diodes(OLED).　In　this　work,　dense　Al2O3　thin　films　were　achieved　using　atomic　layer　deposition(ALD)　under　low　temperature　of　90,　and　ink-jet　printing(IJP)　was　applied　to　deposit　PMMA　thin　films　on　the　surface　of　Al2O3　thin　films　with　different　resolutions　in　terms　of　dots　per　inch(DPI).　It　was　found　that　Al2O3/PMMA　laminates　exhibited　good　barrier　performance　and　optical　transmittance.　The　water　vapor　transmission　rate(WVTR)　of　the　3　dyads　Al2O3/PMMA　laminates　showed　WVTR　of　8.34×10-5　g/(m2•d).　Besides,　the　optical　transmittance　of　the　thin　films　was　higher　than　95%　in　the　visible　wavelength,　exhibiting　good　barrier　and　optical　performances　in　OLED　encapsulation.　©　2021,　Science　Press.　All　right　reserved.