The dependence of radiation temperatures and coupling efficiencies of cavity targets on the target structures and laser irradiation conditions are investigated.Shenguang Ⅱ fundamertal-frequency laser with wavelength 1.053 μm, energy 3～5 kJ/8 beams, pulse width 0.6～0.9 ns is employed to irradiate gold cavity targets. The broadband soft X-ray spectrometer and flat response detector are used to measure the soft X-ray spectrum and its angular distribution from the diagnostic hole on cavity target. At the same time, technology of temporal and spatial resolution image with 5 pinholes is used to observe the X-rays emitted from the diagnostic hole on the cavity target, and then the correction factor of effective area of the diagnostic hole is obtained. Meanwhile, above-mentioned soft X-ray detection elements are calibrated by BSRF-3W1B beam in the region of 50～1500 eV to improve the irradiation power and diagnostic temperation.