In order to obtain high order harmonic spectra with high-intensity, a method of chirp-delay regulation is proposed to control the harmonic intensity of H+2 and D+2. The results show that, when driven by shorter pulse duration, both of the harmonic spectra of H+2 and D+2 mainly come from the falling-region of laser field. Therefore, by properly introducing a chirp in the falling-region of laser field, the high-intensity spectral continuum can be obtained, and the harmonic intensity of H+2 is higher than that of D+2. However, when driven by longer pulse duration, the main contribution of harmonic spectra of H+2 and D+2 come from the rising and the falling region of laser field, respectively. Thus, the corresponding high-intensity spectral continuum can be produced by introducing the chirps in the rising or the falling region of laser field, and the harmonic intensity of H+2 is lower than that of D+2 in this case. Finally, by selecting the appropriate spectral continuum and superposing the harmonics, a single attosecond pulse with the pulse duration of 36 as can be obtained.