A coupling field is introduced into the L -three-level scheme driven by a coupling field and a probe field,and then the L -three-level scheme is driven by two coupling fields. The probing absorption spectrum is researched in theory by solving the density matrix equation of motion. The spectrum is characterized by a series of doublets when the Rabi frequencies of the two coupling fields are equal where one coupling field is exactly resonant with the transition and the other is detuning with the transition. The positions of peaks are dicussed. These situation is interpreted well by dressed states.