Experiments studing temporal –spatial distribution of radiation in Hohlraum are reported. Two laser beams with wavelength 1.053m m irradiated from two ends of a cylindrical target are used. Three sub –keV X ray energy spectrometers have measured the radiation in Hohlraum for different direction through diagnostic pinhole or laser entrance holes. Finally, the temporal –spatial distribution of the radiation temperature in Hohlraum is given.