In this paper,the field of magnetic dipole in the conducting horizontal cylinder is decomposed into 1stdegree field and 2nd degree field of single magnetic pole,field inside the cylinder and field outside the cylinder.Then the fields of the two single magnetic poles are superimposed upon each other to form the field of magnetic dipole.With programs compiled,the 2nd degree magnetic fields of imaginary and real components of the frequency response function for the general field are calculated separately.