In order to study the light field distribution of the total reflection tunnel in 1D photonic crystal, the light field formula of TE wave in 1D photonic crystal is deduced, and the light field of the total reflection tunnel in1D photonic crystal is studied. Based on the formula, distribution feature of light field inside photonic crystal is studied in 1D photonic crystal total reflection tunnel. Light field distribution changes periodically with the propagation depth inside photonic crystal increases and light field does not vary with the propagation depth increased attenuation, and light field distribution of the total reflection tunnel has characteristics of the resonance.