Using the boundary conditions of TM wave, the light field of TM wave in one-dimensional (1D) doping photonic crystal is deduced, and the light fields of defect modes of TE wave and TM wave in 1D doping photonic crystal are studied. The light fields of defect modes of TE wave and TM wave exhibit the characteristic of resonance in impurity layer, and the light fields decrease with the increase of the optical thickness in band gap.