The　current　extended　reality(XR)　community　is　developing　rapidly,　and　is　promoting　the　development　of　the　metaverse　industry.　Each　XR　community　could　be　deemed　as　a　sub-metaverse.　This　has　attracted　a　group　of　internet　giants　and　individual　developers　to　generate　their　own　forms　of　metaverse　products.　While　there　is　not　such　a　system　that　is　able　to　achieve　the　goal　of　crossing　all　these　metaverse,　which　appear　to　be　contradictory　to　the　original　concept　of　the　metaverse:　relating　every　virtual　world　to　a　universe.　To　handle　this　problem,　this　paper　proposes　a　cross-platform　metaverse　data　management　system(CMDMS),　which　is　committed　to　allowing　users　to　employ　their　own　profile　and　space　across　different　metaverse　platforms.