The electromagnetically induced two-photon transparency (EITT) under the control of coherent field is investigated. The effect of external coherent field on the features of two-photon absorption is discussed and the physical mechanism of eletromagnatically induced two-photon transparency and resonance absorption enhancement is analyzed. The analytical expression of second order approximation of population in the up energy level of two-photon absorption under the control of coherent field is derived from the equation of motion for the atomic density matrix. At the same time, the analytical expression of two-photon transition rate is derived by the way of perturbation theory in the dressed states representation. The effect of Doppler broadening on two-photon absorption profile is duscussed.