Electromagnetically induced transparency (EIT) [1,2] has been attractive over past two decades.The absorption coefficient and refractive index, seen by the probe light which is strongly absorbed by a multi-level atom can be dramatically modified by another laser light which is coherently coupled to a common state.The applications of EIT include slow-light [3], all optical switches [4,5], quantum information [6,7] and ultra-short-pulse [8].Our simulations are to drive a A-type atom of three energy levels with femtosecond probe and coupling coherent pulses.Contrary to traditional EIT experiments, ultra-short and strong Gaussian pulses are used here to drive the atom for the purpose to explore the non-perturbative dynamical region of EIT phenomenon.The atom is simulated by quantum-mechanical density matrix without the rotating-wave approximation and the electromagnetic field is described classically.