When single mode coherent light field interacts with two identical entangled two-level atoms, the population number evolution of entangled atoms is studied by means of the multi-photon anti-Jaynes-Cummings model. Influence of average photon number of the coherent light field and transition photon number on the population number evolution of entangled atoms was discussed. The result indicates that the probability difference of the excited state and ground state of the entangled two-level atoms will decrease and whole of oscillation curves of the population number will rise with increasing of average photon number of coherent light field. With the increasing of the transition photon number, the probability difference of the excited state and ground state of the entangled two-level atoms will increase and whole of the oscillation curves of the population number will descend.