Fine　powders　of　pure　perovskite　Pb(Fe1/2Nb1/2)O3　(PFN)　were　prepared　successfully　by　the　coprecipitation　method　and　using　the　raw　material　of　Nb2O5　changed　into　a　water-soluble　species　through　the　chemical　chelation　as　the　Nb　source.　Aqueous　ammonia　was　used　to　modulate　the　pH　of　the　solution　to　realize　the　simultaneous　precipitations　of　hydroxides　of　Nb5+,　Fe3+,　and　Pb2+　ions.　The　experiment　results　show　that　the　perovskite　phase　occurs　at　a　low　temperature　of　400°C　in　the　calcination　of　the　precipitation　product.　X-ray　diffraction　and　Raman　scattering　spectra　results　show　that　pure　perovskite　PFN　powder　was　synthesized　at　800°C.　Scanning　electron　microscopy　observation　shows　that　the　powder　has　a　cube-like　shape　and　nanoscale　grain　size　of　300-500　nm.