Considered the dispersiveness of metal,the band structures of 2-D triangular lattice metallic photonic crystals is analyzed using the FDTD method.Two kinds of metal：Ag and Al are considered.Taking Ag for example,the first band gap′s upper limit frequency of the triangular lattice is 0.90 and the second band gap′s bound is 1.24~1.41,while the first band gap′s upper limit frequency of the square lattice is 0.70 and the second band gap′s bound is 0.84~1.06,when the filling factor is 0.6.The research results indicate that the triangular lattice has a wider first band gap and a higher second band gap.