[en] The results of the experimental investigation of the large intensity Nd-glass laser radiation interaction with dense high-temperature plasma are given. The reflection of radiation incident on the plane lithium deuteride target at the light intensities up to 3x10¹⁶ W/cm² has been studied for the first time. Monotonic decrease of the reflection at the light intensity increase within (10¹³-10¹⁶) W/cm² has been found. The spectral characteristics and angular distribution of scattered radiation have been investigated. The electron plasma ''temperature'' determined by the absorbing foil method has been up to 10 keV. Based upon the obtained facts the conclusion about the significant nonlinear character of the intense laser beam-dense hot plasma interaction is made