This　paper　presents　the　coupling　stiffness　modeling　of　an　XY　flexure-based　manipulator.　Stiffness/compliance　equations　for　compliant　mechanisms　are　first　obtained.　According　to　a　simplified　spring　model,　the　input　stiffness　and　coupling　stiffness　of　the　proposed　manipulator　consisting　of　outer　and　inner　kinematic　chains　are　then　derived.　This　simplified　spring　model　is　composed　of　four　parallel　chains,　such　as　the　left,　lower,　upper　and　right　parallel　chain.　Subsequently,　the　external　force/moment　and　the　output　displacement　of　the　manipulator　are　analyzed　by　using　finite　element　analysis　(FEA).　Finally,　a　prototype　of　the　manipulator　is　fabricated.　Its　motion　range　and　the　corresponding　cross-coupling　displacements　are　measured,　and　thus　the　cross-coupling　ratios　can　be　derived.　It　demonstrates　that　the　manipulator　possesses　good　decoupling　characteristic,　and　the　proposed　theoretical　model　is　reasonable　and　accurate.