This work presents experimental investigations of the process of synthesizing poly(ethylene-co-cyclohexylene-dimethylene-terephthalate) by using terephthalic acid (TPA) or dimethyl-terephthalate (DMT) as well as ethylene glycol (EG) and cyclohexane dimethanole-1,4 (CHDM-1,4). Physico-mechanical characteristics of the co-polyesters were estimated by the methods of relaxation electrometry and tension. The structure of obtained samples of polymeric materials was studied by the DSC. The data has shown that the poly(ethylene-co-cyclohexylenedimethylene-terephthalate) containing 3.3 mole% of CGDM in its structure is unable to crystallize. Using the NMR spectra of the nuclei 13 C the character of distribution of the CHDM-1,4 links in the co-polyester molecules was estimated. It was proved that the number of the ETC and CTC triads in macromolecular composition increased with the growing share of the bound co-monomer.