To further explore enhanced Raman scattering of surface metallic photonic crystal fiber, a model in FDTD of flat structure was built, using observed phenomenon of super-transmissive Raman scattering theory. In the photonic crystal surface of metal terahertz electromagnetic experiments, it is obtained that the greater energy of incident wave, excitation of surface plasmon resonance is more, surface metal can be achieved in the reinforcing effect which is greatly enhanced; Raman scattering effect is obvious by terahertz band, and the effect of the absorption spectrum and fluorescence effects are relatively small, which can significantly improve the sensitivity and resolution.