Besides　small　radius　curves　and　rail　joints,　railway　turnout　is　one　of　the　weak　parts　of　railway　track　structure.　Due　to　its　complex　geometry　linetype,　turnout　becomes　one　of　decisive　factors　to　define　the　speed　that　is　possible　by　means　of　the　diverging　route　of　the　turnout.　A　sophisticated　system　was　developed,　which　could　effectively　complete　the　turnout　geometry　linetype　design　and　drawing.　The　foundational　theory　and　the　method　applied　in　this　system　were　described　and　illustrated　respectively　in　this　paper,　the　structure　and　the　functions　of　this　system　were　explained　in　detail.　This　system　can　achieve　the　calculation　of　turnout　plane　parameters　and　the　drawing　of　its　geometry　linetype　accurately　and　rapidly,　so　it　improves　the　design　quality　and　efficiency　greatly.　©　ASCE.