Using the transfer matrix and the equivalent principle,the Tamm state on the surface of the symmetric photonic crystal is investigated in the new point of energy levels.The result shows that the symmetric system is an finite periodic structures for photonic crystal,it supports the optical Tamm state appearing on the surface,andthe doubly degenerated energy level of TE and TM polarization appears in the energy band,when the optical transmission without the axial transmission,the optical Tamm state form the passband edge non-degenerate energy which are restricted on the surface of photonic crystal.There is an strong local electric field in the Tamm surface state,and it is strongest on the interface.The energy transfer of the Tamm surface state is fast in medium for low refractive index,the transfer can be positive or opposite direction.In medium for high refractive index,the energy transfer of the Tamm surface state is slow; the transfer only can be positive direction,whence a strong local electric field appears on the interface of medium for high refractive index.Properties of optical Tamm state on the surface for photonic crystal can provide guidance for research and design optical waveguide or surface wave sensor.