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The needle-like and dendrimer NaxK1-xNbO3 nanocrystals were synthesized through hydrothermal reaction for the first time using Nb2O5 and KOH as raw materials.The change of structure and morphology were discussed with reactive conditions.The XRD study indicates that NaxK1-xNbO3 powders with single-phase perovskite structure can be formed at a low temperature as 150 ℃.The SEM images showed that the needle-like and dendrimer NaxK1-xNbO3 nanocrystals were only synthesized for the specimen with x=0.15.Nb2O5 Nanoparticles and KOH were heated at 150 ℃ for 5d to form the needle-like Na0.8sK0.15NbO3 with widths of 100-150 nm.Nb2O5 nanowires and KOH were heated at 150 ℃ for ld to form the dendrimer Na0.s5K0.1sNbO3 with widths of 100-250 nm.The Nb2O5 nanowires can be act as template in the templated grain growth process.The crystal morphology of NaxK1-xNbO3 powder changed from cube to needle-like or dendrimer after increasing reaction time.