Abstract: Using the two kinds of excitation spectra of approach for the satisfactorily reproducing nuclear complex spectrum, this treatment revealed a new understanding of phase transitions as the basis state structure of original excitation mode and its advantages in energy were relieved by de-excitation, the basis state of high-ordered structure release energy, at the same time the basis state structure of the low-energy excitation mode was restructured, the transition between new basis state and old one was achieved. This kind of change is one that is completed by the adjustment of the nuclear coupling strength, and a dynamic microscopic fundament of the rotational driven quantum phase transition, which is a suave microscopically. This new understanding is obtained from theory of potential energy surfaces of the Bohr collective model. Thus, the results of micro-sdIBM-(F)^—_max are supported by the Bohr collective model.