Processing　the　non-round　parts　on　XY　direct-drive　platforms,　the　contour　error　could　not　be　reflected　by　X,　Y　axis　tracking　error,　and　the　direction　of　the　contour　error　was　closely　related　with　the　following　error　and　the　profile　shape　irregularities,　which　was　difficult　to　compensate　the　contour　error.　Aiming　at　this　problem,　the　non-circular　parts　processing　mechanism　on　XY　platform　was　analyzed,　and　the　XY　axis　tracking　error　coupling　form　contour　error　calculation　model　for　the　outer　surface　and　inner　surface　processing　was　proposed　respectively.　The　XY　direct-drive　simulation　model　was　constructed,　and　the　modified　heart-shaped　curve　outer　surface　and　inner　surface　processing　was　taken　as　the　example　to　contrast　the　conventional　processing　control　simulation　experiments　with　feed　forward　cross-coupled　contour　of　error　compensation.　The　proposed　tools　path　method　was　used　to　further　verify　the　XY　contour　error　model,　and　the　results　showed　that　the　XY　contour　error　model　had　very　high　accuracy　and　the　feed　forward　cross-coupling　controller　could　effectively　improve　the　contouring　accuracy　of　the　XY　platform.