In order to study on effect of different structures on property of tin dioxide（ SnO

2

） gas

SnO

2

nanorods and nanotubes are prepared by electrospinning

and the gas-sensitive properties to NO2 and NH3 are investigated.The results show that the response of SnO

2

nanotubes is better than that of SnO

2

nanorods to NO2 gases

which can realize linear detection of NO2 gas in the range of 100

1 000 × 10-9 at room temperature and its maximum response can reach up to 95. 8 % to 1 000 × 10-9 NO2 with good repeatability. Moreover

the response time and recovery time are both less than 15 s

which are shorter than most of SnO

2

gas sensors.