  I have used a practical method to calculate the one-loop quantum correction
to the energy of the non-topological soliton in Friedberg-Lee model. The
quantum effects which come from the quarks of the Dirac sea scattering with the
soliton bag are calculated by a summation of the discrete and continuum energy
spectrum of the Dirac equation in the background field of soliton. The phase
shift of the continuum spectrum is numerically calculated in an efficient way
and all the divergences are removed by the same renormalization procedure.
