  The multinucleon transfer reactions has been investigated within the
dinuclear system model. The nucleon transfer is coupled to the dissipation of
relative motion energy and angular momentum by solving a set of microscopically
derived master equations. A barrier distribution approach is implemented in the
model in order to including the contributions of different orientations and
dynamical effects. The available data of fragment production via multinucleon
transfer reactions could be understood with the model for the reactions of
$^{136}$Xe + $^{198}$Pt/$^{208}$Pb near Coulomb barrier energies. It is found
that the production of heavy neutron-rich nuclei weakly depends on the incident
energy. However, the yields of proton-rich nuclei increase with the incident
energy.
