In order to obtain a band stop filter with filtering function and achieve broadband filtering,this study designed a metal- insulator-metal (MIM) hybrid plasma waveguide,its structure consists of a double sheep horn pin resonator and an MIM straight waveguide.The transmission spectrum characteristics and z-direction magnetic field distribution of this structure were calculated using the finite difference time domain (FDTD) method.The calculation results indicate that a U-shaped region with band stop filtering characteristics is formed between the two Fano-resonance peaks,its filtering band stop width can reach 0.99 μm,achieving broadband filtering function.Based on the tunability of the structure,adjusting the distance L,height H,and radius R between the double sheep horn pin resonators can change the resonance wavelength and band stop band.In addition,by adding a new sheep horn pin resonator and forming a cascaded structure,a new Fano-resonance peak can be obtained and the band stop filtering characteristics can be improved.The structural characteristics obtained in this study can provide ideas for the design of optical devices such as band stop filters and sensors.