通过研究两全同原子初始处于最大纠缠态，光场处于单模时的原子纠缠动力学及Tavis-Cummings模型（TC模型），分析了在TC模型全同原子系统的Hamilton量中加入Stark位移时对原子纠缠的退相干时间的影响.结果表明：不考虑Stark位移时两原子在系统演化过程中周期性地出现退纠缠现象；考虑Stark位移时，两全同原子长时间地纠缠.

Two identity atoms initially in a maximally entangled state, the fields in the singlemodel thermal fields, and the TavisCummings (TC) model are studied. Effects of Stark shift added in the Hamilton of the two identity atoms TC system on the decoherence time of atomic entanglement are analyzed. The results show that the two atoms evolve periodically into a disentangled separable state when Stark shift is not considered; the two atoms keep longlived entanglement when Stark shift is considered.