Abstract: We studied fully and systematically the scaling laws of various abnormal absorptions and property of hot electrons for 1.053m m laser –irradiated hohlraum targets, which were observed with various energy calorimeters and spectrometers at the “Shen Guang –I” facility, from 1990 to 1994. Spectral characteristics, energy of various abnormal absorptions, the hard X ray spectrum are obtained in hohlraum targets. The relation of spectrum and energy of SRS, temperature and energy of hot electron versus laser parameters and targets type are given. Hot electrons and SRS can be reduced obviously for short laser wavelength.