Abstract: By using an unique hydrothermal hot-press（HHP） technique,ZnO porous nanosolid and Fe₂O₃ doped-ZnO porous nanosolids（the content of Fe₂O₃ is 1 wt %,2 wt % and 5 wt % respectively） were prepared from ZnO nanopowders（with average particle size of 30 nm） and Fe₂O₃ nanopowders（with average particle size of 90 nm）.Furthermore,four gas sensors were fabricated using pure ZnO porous nanosolid（denoted as ZF0） and Fe₂O₃ doped-ZnO porous nanosolids（denoted as ZF1,ZF2 and ZF5 respectively）.The intrinsic resistances（the resistance of sensor in air） and gas sensing properties to ethanol,petrol,acetone,xylene,hydrogen,methane and carbon monoxide of ZF0,ZF1,ZF2 and ZF5 were tested.The results indicated that the doping of Fe₂O₃ has obviously lowered the intrinsic resistances of the ZnO nanosolid thick film gas sensors and increased their working stability at nearly lower temperature.At the same time,their sensitivity to ethanol and petrol can be improved by the doping of proper amount of Fe₂O₃.The reason for the above improvement has been analyzed on the basis of micro-morphology observations.