A new ferroelectric solid solution of (1−x)Ba(Lu 1/2 Nb 1/2 )O 3 –xPbTiO 3 (BLN–PT) (0≤x≤1) has been synthesized by solid state reactions. Its structure and electric properties have been studied by X-ray diffraction and di-/ferro-electric measurements. Based on the investigation, a partial solid state phase diagram of the binary BLN–PT ceramics system has been established, which exhibits a morphotropic phase boundary (MPB) region in the composition range of 0.64≤x≤0.68. The Curie temperature is measured to be around 250°C in the vicinity of the MPB region, which is much higher than that of PMNT or PZNT system. The dielectric behavior has been discussed based on Curie-Weiss Law and Lorentz-type quadratic relationship. With increasing PT content, a transformation from relaxor to ferroelectric phase has been demonstrated in the solid solution system.