Defect mode of doped one-dimensional photonic crystal with positive-negative index alternant multilayer are studied by using transfer matrix method.It is found that the FWHM of defect mode and the transmissivity of the transmission band are increased with the increase of dope′s refractive index when the optics thickness dose not change of dope′s.That the number of defect mode is reduced and the FWHM of defect mode is decreased with the increase of the dope′s optics thickness when the dope′s refractive index is invariable.