Abstract: The experimental investigation on non-equilibrium of Au plasmas irradiated directly by laser and heated by X-ray radiation was made in this paper. The physical mechanism was investigated and analyzed. Two kinds of targets, which were cone-disk and annulus-disk targets, were designed to study reemission ablated by Ｘ-ray radiation. The experimental results showed that cone-disk target could avoid the effects of plasma expansion from cone and laser scattered by cone on reemission from X-ray heated area, and emission spectrum from X-ray ablating disk is "pure and clear", but annulus-cone couldn't avoid effects of plasma and scattering laser．