The　pure　perovskite　NaNbO3　(NN)　nanopowders　were　prepared　using　a　molten　salt　synthesis　method　(MSS)　at　800　degrees　C　for　4　h,　with　raw　materials　of　analytical　grade　Na2CO3　and　Nb2O5　in　KCl　flux　salts.　The　phase　composition　and　morphology　of　the　synthesized　powders　were　investigated　by　XRD,　SEM　and　TEM.　Compared　with　the　conventional　solid　phase　process,　the　NaNbO3　powders　synthesized　by　MSS　were　pure　and　free　of　hard　agglomeration,　consisting　of　similar　cubic　structures　with　an　average　size　of　about　200　nm.　The　formation　mechanism　of　nanocube　NaNbO3　can　be　attributed　to　the　dissolution-precipitation　process.