By means of the quantum theory, the interaction between two-atoms located inside a dissipative cavity and single-mode coherent field was studied. The entanglement properties, between two atoms and between two-atoms and light fields, were analyzed. In addition, the reason that the decay of the cavity field and the detuning between the atom and cavity field affect the evolution of entanglement was discussed. The results show that when there is cavity loss, entanglement between the atoms and light fields may occur, however entanglement gradually disappear in the long time limit. Also, the detuning between the atom and cavity field significantly affects the entanglement.The entanglement between two atoms initially in the maximally entangled states is gradually weakened due to the decay of the light field, but the detuning between the atom and the cavity field can inhibit this decay.