In order to study the effect of sample temperature on the characteristic parameters of laser induced breakdown aluminum (Al) plasma, we use a double-pulse laser to induce the Al sample heated in intermediate frequency furnace to form plasma. And then we analyze the intensity changes of different characteristic spectral lines and the morphology changes of plasma plume collected by CCD camera when the Al sample temperature changes. Under the assumption of local thermodynamic equilibrium, we use Boltzmann oblique line method and Stark broadening method to analyze the evolution law of plasma electron temperature and electron density with the sample temperature. The full widths at half maximum (FWHMs) of different spectral lines varing with different sample temperatures are analyzed by Lorentz linetype fitting. The experimental results show that the morphology and size change of plasma plume is a direct reflection of the change of the characteristic parameters of plasma such as electron temperature and electron density. As the sample temperature increases, morphology of plasma plume, spectral line intensity, FWHM, electron temperature, and electron density will become saturated. For ionic and atomic lines, the sample temperature has different enhancement effects on the spectrum intensity and FWHM.