We report results of a DSC study of the influence of stretching on the processes of melting of blocks in copolyetheramide based on polytetramethyleneoxyde and polyamide-12 (PA-12). It has been found that uniaxial stretching of the film brings significant changes to the PTMO block and has almost no influence on the thermal characteristics of PA-12. The melting of PTMO acquires multiplet character. The melting peaks are shifted to the region of higher temperatures and their areas are redistributed with an increase in the degree of deformation. It has been found the degree of crystallinity of PTMO increases under stress.