In this research was investigated the processes of copolymerization of lactic acid withcaprolactam and betulin under the conditions of Microwave Irradiation (MWI).As a result of this work were determined that the copolymerization of lactic acid with betulin under theconditions of MWI leads to the formation of a product which has high solubility in toluene. Interaction oflactic acid with caprolactam under the conditions of MWI results to the formation of copolymer, which has the properties that are typical for polylactideas as well as for caprolactam