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K_4Ce_2Nb_(10)O_(30) ultrafine powders were prepared by stearic acid method (SAM). The obtained products were analyzed by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectrometry, scanning electron microscopy and UV-visible absorp-tion spectra. XRD patterns revealed that K_4Ce_2Nb_(10)O_(30) powders treated at 900 ℃ for 2 h presented tetragonal structure without the presence of deleterious phases. Furthermore, the K_4Ce_2Nb_(10)O_(30) prepared by SAM had considerable activity under visible fight irradiation.