Based on the rectangular resonator metal-insulator-metal (MIM ) waveguide structure, we have presented and proven a new type of surface plasmon band-stop filter using the two-dimensional finite-difference time-domain method (2-D FDTD). This structure consists of a waveguide channel and a column of rectangular cavity resonator,which is parallel to the waveguide. When F-P conditions are met between the length of the rectangular cavity and the wavelength, the surface Plasmon (Surface Plasmon Polaritons, SPPs) of the wavelength will be restricted in the cavity, which results in the filtering effect. By adjusting the length and the number of the resonator, we can easily filter out one or more specific single wavelength. Compared with other structures of SPPs filter, this structure is more concise and can filter narrower wavelengths with smaller energy loss. It can be applied to optical equipments in high integrated circuit devices.