By adjusting the polarized angle of a two-color laser field that is synthesized by a 12 fs/2000 nm and 12 fs/800 nm, we find that the spectrum of the high-order harmonic generation has a “funnel structure” in the second plateau when θ is π/2. And when θ is π/6, a bandwidth of supercontinuum about 290 eV is observed. We illustrate the structure of the high-order harmonic generated spectrum by the time-frequency analysis. An isolated attosecond pulse is obtained by intercepting an arbitrary 70 eV width in the supercontinuum plateau, and whose full width at half maximum (FWHM) is about 60 as. When we intercept a narrow width of the bandwidth of supercontinuum, a linear polarized attosecond pulse with FWHM 94 as is obtained. All those are convenient to generate and use attosecond pulse in experiment.