By considering the dynamic Stark shift, the effects of dynamic Stark shift of level and the squeezed light field factors Y on the fidelity of quantum state are discussed. It is shown that the evolutions of the fidelity obviously exhibit the oscillations of quantum collapse and revival. Taking the Stark shift into consideration, a comparative study of the two processes for the fidelity is presented. The fidelities of the atom, the field and the system are higher than those in the absence of the dynamic Stark shift when manipulating and communicating quantum information. Meanwhile, the periodicities of the fidelity evolutions of atom, field and the system are modulated by the intensity of the initial light field, and the impulse of the oscillation of fidelity for the field become smaller. The energy between field and atom is influenced by the squeezed light field factors.