Abstract: By using the finite different time domain (FDTD) method for the electromagnetic scattering of magnetized plasma, the band gap properties of two dimensional space-varying magnetized and unmagnified plasma photonic crystals (PPC) were studied. Model of two-dimensional plasma phonic crystals was built. With the differential Gaussian pulse as the incidence source, the reflection coefficients of the PPC were computed with the normal incidence condition, and its plasma as the variation of the periodic Gauss pulse function. The characteristics for the forbidden band gap of PPC were analyzed under different space pulse width. The results show that the band gap can be controlled by changing the plasma frequency in different space changes.