A　novel　nanoflower/rod-like　hierarchical　SnO2　was　prepared　one　step　on　FTO　conductive　glass　which　has　SnO2　seed　crystal　under　hydrothermal　condition　at　200　with　SnCl4　and　NaOH　as　raw　materials.　The　morphology,　crystal　phase　composition　and　gas-sensing　performance　of　the　product　were　tested　by　SEM,　XRD,　N2　adsorption-desorption　and　gas-sensing　tester.　The　results　indicate　that　the　product　is　tetragonal　phase,　and　＇nano　carpet＇　is　formed　by　nanorod　arrays　which　are　perpendicular　to　the　base　in　the　hierarchical　SnO2　and　with　spherical　nanoflowers　growing　on　it,　and　the　nanorods　and　petals　are　all　assembled　by　fuzzy　fibers;　its　specific　surface　area　is　109.8　m2•g-1　which　is　13　times　than　that　of　the　ordinary　precipitated　SnO2　powder.　The　product　has　high　gas　sensitivity　which　is　36.1　to　1000×10-6　acetone,　7.9　times　of　the　ordinary　precipitated　SnO2　powder.　©　2021,　Journal　of　Materials　Engineering.　All　right　reserved.