We have devoted much efforts to investigating the doping evolution of the magnetic excitations in electron doped BaFe2-xNixAs2 (x=0-0.6). Spin excitations for x=0-0.6 have been well studied. Though new discoveries such as spin excitation hardening and spectra weight decrease have been made in x=0.6, two issues remain to be explored experimentally by measuring higher doping. First, the spin gap size does not change from x=0.3 to 0.6, which is inconsistent with Fermi surface nesting picture and needs to be investigated. Second, since the decrease of the local susceptibility with doping is very slow, the effect of electron doping on the spin state of Fe needs to be investigated at much higher doping. Therefore, we propose to address the above issues by studying a much higher doping (x=1.2) using time-of-flight neutron scattering at MAPS, where we measured our x=0, 0.3 and 0.6 samples.