Uniform acicular hematite particles were prepared by two steps hydrothermal method from Fe(OH)(3) gel. The effect of nucleating temperature, pH and Sn4+ ions on the morphologies of hematite particles was studied. The experiments showed that uniform acicular particles can be obtained. First the suspension of Fe(OH)(3) aged at 50 similar to 80 degrees C for 2h, crystal growing-agent was then added, and put into a stainless steel autoclave with-stirring at 150 similar to 170 degrees C for 1.5h. The key problem of the poor repeatability of experimental result was solved. The results were characterized by TEM and XRD.