The crystal symmetry and the influnce of the crystal field terms (odd and even) to the transition of electric dipole of f

N

configuration

are considered. The new wave function is given. The element matrix expression of electric dipole transition between the energy levels of f

N

configuration is derived. By using the expression

we disscus and explain the J

1

=0→J

2

=0 transition

and it is compared with Judd result.