In　this　paper,　fuzzy　logic-based　vertical　handoff　decision-making　algorithm　is　presented　for　heterogeneous　wireless　networks　which　consist　of　WLAN,　WMAN　and　WWAN.　The　parameters　which　are　proposed　by　multi-criteria　vertical　handoff　algorithm　are　set　as　inputs　of　the　proposed　pre-selection.　According　to　the　situation　of　network　and　the　status　of　mobile　terminal,　an　output　value　is　produced.　This　output　value　is　used　to　determine　whether　a　handoff　process　is　necessary　or　not　and　to　select　the　best　candidate　access　point　in　the　candidate　networks.　The　results　show　that　the　proposed　model　provided　better　performance　in　terms　of　minimizing　unnecessary　handoffs　and　higher　user　satisfaction　levels.