A near-panda cladding photonic crystal fiber（NPC PCF） based surface plasmon resonance（SPR） sensor is analyzed.Under the boundary condition of anisotropic perfectly matched layer（PML）,a full-vector finite element method（FEM） is used to calculate the fiber model.The effective refractive index of the mode field is finally obtained.The sizes of the various parameters in the sensor are discussed.Numerical results indicate that the excitation of the plasmon mode is sensitive to the change of the refractive index of adjacent analyte.The maximum spectral sensitivity of the sensor can be about 2 μm/RIU.Its resolution can reach 5×10-6 RIU if the spectrometer has a demodulation resolution of 10 pm.