The　grain　size　and　fine　structure　of　Sb　doping　α-Fe2O3　nanocrystalline　phase　obtained　by　a　sol-gel　process　have　been　studied　with　X-ray　diffraction,　transmission　electron　microscopy　and　Mossbauer　spectrometer.　The　results　show　that　before　doping,　the　grain　size　of　αFe2O3　formed　through　crystallization　of　Fe(OH)3　amorphous　dry　gel　is　rather　coarse.　After　Sb　doping,　some　of　Sb　atoms　participate　in　the　formation　of　FeSbO4.　When　heat　treated　at　high　temperature,　the　solute　atoms　separate　out　from　α-Fe2O3　phase　and　enable　the　rapid　growth　of　the　grains.