In　the　model　setting　of　multiregional　macroeconomic　research,　the　constant　return　on　scale　of　all　production　functions　and　the　free　flow　of　all　production　factors　cannot　be　combined.　Otherwise,　the　potential　theoretical　conflict,　that　is,　the　problem　of　contradiction　equations,　may　arise.　If　there　is　a　unified　capital　interest　rate　in　the　market　and　the　return　on　scale　of　production　in　all　regions　remains　unchanged,　it　is　necessary　to　set　restrictions　on　the　flow　of　labor　force　in　order　to　realize　the　differential　wages　among　regions.　When　the　interest　rate　is　not　too　high,　the　regional　wage　increases　with　the　larger　output　capital　elasticity.