The properties of magnetic recording materials largely depend on their shape magnetic anisotropy. The control of their shape and size distribution is very important for improving magnetic properties. The silica-coated goethite$(SiO_2$/$alpha$-FeOOH=1.5wt%) having acicular shape was prepared. The sillica-coated goethite was heat-treated at 40$0^{circ}C$~1,00$0^{circ}C$ 1hr and then reduced at 50$0^{circ}C$ 2hr. When the silica-coated goethite was heat-treated at 80$0^{circ}C$ its acicular shape was maintained and its magnetic properties were improved(Hc: 1,325 Oe $sigma$m:138.8 emu/g, Rs:0.56) However the acicular shape of the paricles was broken for non-coated hematite obtained by dehydration at 80$0^{circ}C$ They were sintered and showed poor magnetic properties.