This work reports measurement of the molecular orientation by two techniques for nylon 6 fibers drawn at room temperature. The changes in the strain and optical parameters are used to obtain some macrostructural parameters to evaluate the cold-drawing process values of the mechanical orientation functions, [P-2(cos theta)], [P-4(cos theta)], amorphous and crystalline orientation functions (F-c and F-a), and the molar number of chain segments per unit volume (N-e). Also the crosslink density (N-0), the chain entanglement density (N-s), the average optical orientation F-av, the dielectric constant (epsilon), the dielectric susceptibility (eta), the shrinkage stress (k(s)), and other parameters were calculated. Relationships between the calculated parameters are given. The present study demonstrates changes in the molecular reorientation factors and the obtained new physical properties resulting from cold-drawing process. (C) 2004 Wiley Periodicals, Inc.