Similar magnetic excitations have been observed in high-transition-temperature (high-Tc) cuprates by time-of-flight neutron spectrometer, namely, a characteristic hourglass-like magnetic excitation. The hourglass-like excitation consists of downward and upward dispersions from an antiferromagnetic (AF) zone center. Recently, we have clarified that the energy of the crossing point in LSCO system is decreased by nearly the same factor as the reduction in Tc upon Ni-doping. This can be explained by the change in effective J caused by magnetic Ni impurity. However, it is not clear that the shifts of crossing point by Ni-doping is due to the decrease in effective J or due to the partial shift of the spectrum. The aim of this proposal is to study the Ni-impurity effect on effective J. If Ni-doping suppresses Tc via reducing Jeff, magnetic interaction should be glue for Cooper-pairs.