Low　dielectric　constant　materials　are　appropriate　solutions　to　address　the　propagation　delay　problem　in　ultra-large　scale　integrated　circuits.　Herein,　adamantane　is　applied　to　improve　the　dielectric　properties　of　polybenzoxazines.　Monomers　synthesized　from　bisphenol-A,　4,4＇-diphenol　and　1-amino　adamantane　are　developed　for　understanding　the　properties　of　polybenzoxazines　at　molecular　level.　We　found　that　incorporating　adamantane　results　in　much　lower　dielectric　constant　and　loss　factor　without　sacrificing　the　glass　transition　temperature　and　thermal　stability,　which　are　potential　alternates　as　new　dielectric　interlayer　materials.