Abstract: WO₃ micro/nano-materials with different morphologies were successfully synthesized by an ethanol/glycol solvothermal approach.The morphology,microstructure and sensing property were characterized by FESEM,XRD and self-made sensing mechanism.FESEM shows that the microstructure is gradually evolved form nanowall,nanoneedle to nanowire with the addition of glycol.The core/shell structure will be present when the content of glycol arrives at 20%.XRD indicates that the products with different morphologies belong to tungsten oxide hydrate before annealing.After heat-treated at 550℃,all the products are converted to monoclinic WO₃.For sensing properties,the nanoneedle in reductive gas is the strongest and the nanosheet is the lowest.On the contrary,the nanoneedle in oxidizing gas is the weakest and the nanosheet is the strongest.