Great　attention　has　been　paid　to　one　dimention　nanostructures　due　to　its　high　aspect　ratio　which　contributes　to　Field　Emission　[1-2].　As　an　n-type　semiconductor　with　wide　band　gap　(3.6ev),　SnO2　exhibits　fascinating　electric　characteristics　and　is　widely　used　in　gas　sensor　[3],　solar　cells　[4],　and　photoelectric　apparatus　[5].　Recently　some　studies　on　field　emission　properties　of　various　nanostructures　of　SnO2　are　reported.　Wang　have　reported　the　turn　on　field　of　sallow-like　SnO2　and　fishbone-like　SnO2　are　1.88V/um　and　2.36　V/um　respectively.　And　Li　described　that　SnO2　nanorod　array　produced　a　current　density　of　10uA/cm2　at　a　field　of　1.6V/um.[6-7].　In　this　work,　SnO2　nanowires　were　synthesized　by　thermal　evaporation.　The　morphology　investigation　and　field　emission　measurement　revealed　the　excellent　field　emission　property　and　low　turn　on　electric　field.　©　2010　IEEE.