When an electron is transferred to C60, the bond structure is distorte
d due to the electron-lattice interaction and a polaron-like state is
formed. The evolution process of the bond distortion is studied by the
dynamical equation of atomic lattice, and time-dependent changes of t
he bond lengths are determined. Then it can be estimated that the rela
xation time to form the polaron-like state is a fraction of a picoseco
nd.