To explore the magnetic dipole source frequency domain electromagnetic sounding ability, based on the vertical magnetic dipole source frequency domain electromagnetic profile device as an example, from a vertical magnetic dipole in the Z direction magnetic field formula of one-dimensional layered media, under the condition of low induction number the apparent conductivity of expression is deduced, finally achieved the vertical magnetic dipole source frequency domain electromagnetic sounding method, one dimensional forward; Then the response characteristics of magnetic disourse frequency domain electromagnetic sounding method are analyzed by one-dimensional forward simulation of a typical layered model. The results show that the resistivity sounding can be realized by decreasing the transmitting frequency and increasing the transmitting distance while keeping product of frequency and square of transmittance distance unchanged, which belongs to the combination of frequency and geometric sounding and can accurately reflect the vertical variation information of the apparent resistivity of underground media.