Characteristic aspects of Dimopoulos-Georgi's mechanism for the hierarchy are investigated in a “semi-realistic” SU(5) model by employing the renormalization group method. The hierarchy is really generated in a “sick” theory by quantum resuscitation without any fine tuning of the coupling constants at M W ≈ 10 2 GeV . It can also be realized in a “normal” theory by choosing the coupling constants suitably. In the latter case, the effective potential has two minima at X = 0 and M G . Some suggestions are presented for constructing a realistic model.