In this paper,we design and analyze a novel hybrid tube-triangle plasmonic waveguide(HTTSPPs),which is composed of three high index dielectric nanotubes placed above an equilateral triangular metal with the center corresponding to the three vertices of the triangle.The strong hybridization coupling between Si dielectric nanotubes(SNTs)and the metallic triangular wedge SPP(WSPPs)enables enhanced field confinement inside the gap region as well as long propagation length.