According　to　the　problems　of　hydraulic　system　of　sway　machine,　such　as　commissioning　and　maintenance　are　inconvenient,　impact　of　change　direction　is　big,　system　speed　is　slow,　production　efficiency　is　low,　etc.　It　used　electro-hydraulic　proportional　control　valve　to　improve　design　in　hydraulic　system　of　sway　machine.　Application　of　electro-hydraulic　proportional　control　valve　has　realized　automatic　adjustment　of　the　hydraulic　motor　speed;　it　is　effective　to　solve　variable　speed　movement　of　sway　machine　frame　and　no　impact　of　changing　direction　smooth.　Commissioning　and　maintenance　of　sway　machine　are　more　convenient,　and　it　improves　performance　of　sway　machine.