  Pygmy and Giant Dipole Resonance (PDR and GDR) in Ni isotopes have been
investigated by Coulomb excitation in the framework of the Isospin-dependent
Quantum Molecular Dynamics model (IQMD). The spectra of $\gamma$ rays are
calculated and the peak energy, the strength and Full Width at Half Maximum
(FWHM) of GDR and PDR have been extracted. Their sensitivities to nuclear
equation of state, especially to its symmetry energy term are also explored. By
a comparison with the other mean-field calculations, we obtain the reasonable
values for symmetry energy and its slope parameter at saturation, which gives
an important constrain for IQMD model. In addition, we also studied the neutron
excess dependence of GDR and PDR parameters for Ni isotopes and found that the
energy-weighted sum rule (EWSR) $PDR_{m_1}/GDR_{m_1}%$ increases linearly with
the neutron excess.
