The paper present the results of X-ray diffraction (XRD), Raman scattering, absorption, impedance spectroscopy and magnetization studies of Ni2+ -doped BaTi1-xNixO3. Some Ba atoms were replaced by Ni with x atoms in the range of 0.0 - 0.4. XRD analysis of these samples indicates a change in the cell parameters with doping content and there appears an abnormal point at x = 0.10. The main focus is the Raman peak vs. Ni content, which have separated peaks in the range of 450 cm -1 - 600 cm -1. The shift in Raman and change in absorption spectra are evidence that would relate to the structure change or disorder and impurity in the samples. From the above results, a critical substituent content at which the structural phase change takes place is shown. The author also present the impedance spectroscopy and magnetization vs. magnetic field to elucidate the role of dopant in the BaTi1-xNixO3 samples.