Piezoelectric single crystals of Pb(Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 (PMN–PT) show superior properties to piezoelectric ceramics and piezoelectric films in device applications. However, the applications of PMN–PT single crystals are limited by the lack of a simple and reproducible fabrication technique. By studying the effect of fabrication condition on the growth of PMN–PT single crystals in the flux method, we successfully obtained PMN-PT single crystals. The size of the obtained crystals varied from 1 to 4 mm, mostly showing regular cubic shape. X-ray diffraction technique identified the crystal phase was PMN–PT. Electron diffraction spectroscope analysis indicated that the composition of the single crystals was closed to the designed solid solution. The (001) single crystals showed a dielectric constant peak of 15,200 at 42°C. The crystals had a remnant polarization 16 μc/cm 2 , a spontaneous polarization 22.1 μc/cm 2 , and a coercive field 2.55 kV/cm. Our measurement indicated the temperature dependence and frequency dependence of the dielectric constant and dielectric loss of PMN–PT single crystals. The results will be a great help for the applications of PMN–PT single crystals.