The　directional　movement　of　users’　fingers　has　become　one　of　the　most　interesting　topics　for　human-computer　interaction.　Since　a　large　proportion　of　people　are　right-handed,　most　application　software　for　touch　screen　devices　are　designed　based　on　the　habit　of　right-handed　users.　However,　this　kind　of　design　may　cause　inconveniences　for　the　left-handed　users　when　they　slide　over　the　screen,　and　it　might　lead　to　operational　mistakes.　In　this　study,　a　tunnel　sliding　experiment　is　designed　to　investigate　the　finger　behavior　attributes　of　the　left-handed　population.　According　to　the　experimental　results,　the　finger　behavioral　differences　between　the　left-　and　right-handed　people　are　figured　out,　which　contributes　to　the　design　of　the　user　friendly　software　of　touch　screen　devices　for　both　the　left-　and　right-handed　users.　This　study　is　the　basic　research　of　touch　devices　interaction　design　and　has　a　guiding　value　for　the　user　interface　design　of　mobile　the　touch　devices.　©　2016　Taylor　&　Francis　Group,　London.