We present some results of studying the process of healing experimental wounds in 130 rats under the action of copper-vapor laser radiation of both green and yellow lines. The characteristics studied were the speed of healing and morphological changes of wounds in intact animals and in animals with the interwoven Pliss lymphosarcoma. As a result of this study, we have established that emission of a copper-vapor laser stimulates the regeneration process and inhibits the growth and metastasizing of tumors.