Eu doped LaPO4 nanocrystals were successfully synthesized by molten salt method calcined at 700°C. The structure, morphology and photoluminescence of as-synthesized product were characterized. The results reveal that all the doped samples are well crystalline at 700°C and assigned to the monoclinic monazite-type structure of the LaPO4 phase. It has been shown that the obtained nanocrystals to be long rod-like with diameters of 5-10 nm and length of 100-150 nm. The luminescence intensities strongly improved due to the high crystallinity because of the molten salt as the medium in thermal treatment posscess.