This paper consists of laws of formation of the modified layer on a surface of coatings from zirconium dioxide with the help of laser radiation. The peculiarities of laser processing of TSZ plasma sprayed layers on steel substrates with NiCrAlY bond layers are investigated using CW-carbon dioxide and Nd:YAG as well as pulsed Nd:YAG lasers. The layer surfaces are melted on. These modified layers consisted of macro fragments between 2,000 and 500 micrometer in size. These in turn are composed of micro-fragments between 20 and 70 micrometer in size. In both cases crack gaps are discovered: widths of 10 to 15 and narrow ones of 1 to 5 micrometer. The properties of thermal resistance, hardness, roughness, and density are determined as a function of the laser power output. Paper includes a German-language abstract.