X-ray spectra, angular distributions of X-ray fluxes and evolutions of X-ray spe ctra from the front and the rear of gold foil target with different thickness ha ve been measured on “Xingguang” laser facility, in which the gold foil targets were irradiated by smoothing 1.053μm laser beam . The processes of laser and r adiation ablation to gold foil have been studied. Quantitative X-ray spectra fro m the front and the rear of gold foil under several conditions such as different foil thickness, different laser power densities and X-ray emission angles have been obtained. At the same time, radiative heat wave has also been observed fro m the evolutions of X-ray spectra emitted from the rear of gold foils of differe nt thickness.