Large-scale,　highly-concentrated　wind　power　integrated　into　grids　through　long　transmission　lines　will　bring　significant　challenges　to　power　system　operation　during　steady-state　and　dynamic　processes.　Tremendous　research　has　been　conducted　in　this　critical　area.　However,　few,　if　any　available　testing　systems　have　been　established　to　meet　the　requirements　of　the　research　on　different　time-scales.　The　objective　of　this　paper　is　to　identify　the　functionality　requirements　of　the　testing　systems　for　the　comprehensive　studies,　which　covers　different　time-scale　problems　of　power　systems.　For　this　purpose,　the　realistic　Gansu　power　grids　in　China　and　wind　farms　in　Jiuquan　area　are　selected.　As　a　typical　power　grid　with　large-scale　highly-concentrated　wind　power　integration　by　long-distance　transmissions,　the　characteristics　of　the　selected　wind　farms　and　power　grid　are　discussed　first.　Two　simplified　systems　are　constructed　associated　with　the　major　characteristics.　The　critical　functionality　requirements　of　the　testing　systems　for　different　research　purposes,　i.e.,　system　planning,　operation,　control,　and　protection,　are　identified.　As　the　first　step,　this　paper　scopes　the　key　requirements　and,　ultimately,　a　complete　testing　system　is　expected.