Perfectly Matched Layer （PML） is one of the most efficient absorbing boundary condition recently developed in the world.In this paper

the unsplit PML method was further extended to the lossy media

and was applied to object detecting problems together with the FDTD method.The computing model

the loading of the antennas

and the selection of the PML coefficients were discussed.Also

the coupling between the transmitting and receiving antennas and the lossy medium was analyzed in detail.Finally

some examples were given

in which the antennas were scanning on the medium surface and there are arr cavity and metallic pipes existing in the lossy medium.The method and model presented in this paper are more close to realistic problems

and can be used to establish the data library of object detecting of lossy media

which is very useful to realistic applications.