采用了相干态正交化法研究了耦合强度以及偶极相互作用对Tavis-Cummings模型中两原子的纠缠的影响.与旋波近似比较发现，在弱耦合强度下，非旋波近似下两原子间的纠缠与旋波近似下的结果符合得很好，在强耦合区，原子之间的纠缠出现了突然死亡现象.研究同时发现耦合强度越大，原子间处于可分离态的时间越长，表明了原子间处于退纠缠的时间的长短是依赖于原子-光场的耦合强度的.而考虑了偶极相互作用时，随着偶极-偶极相互作用的加强，原子间的纠缠也将被加强.

Applying the method of coherent-state orthogonalization expansion, the influnences of dipole-dipole interaction and the coupling strength on the entanglement between two atoms of the Tavis-Cummings model without rotating wave approximation(without-RWA) are studied. Compared with the rotating wave approximation(RWA), it is found that the entanglement of the without-RWA agree with that of RWA when the coupling strength is weak. In the strong coupling regime, the sudden death phenomena occurs. The results also show that the stronger the atom-field coupling strength is, the longer the state stays in the disentangled separable state, which means that the length of the time interval for the distanglement depends on the atom-field coupling strength. When the dipole-dipole interacton is taken into account, the entanglement of the two atoms will be enhanced with the increace of dipole-dipole interaction.