Аннотация:A new approach is proposed to describe the spinodal decomposition in polymer systems. In the framework of this approach, spinodal decomposition is described as a relaxation of the single-time correlation function G(q, t) treated as an independent dynamic object. In the one-loop approximation, which plays the role of zero approximation in the proposed approach, a precise solution of the dynamic equation for G(q, t) is found. This makes it possible to follow the asymptotic behavior of G(q, t) at large and intermediate times, starting from the beginning of spinodal decomposition. In the calculations, the dependence of the correlation functions and the kinetic coefficients of a polymer on the wave number q is considered quantitatively. The dependence of the evolution of a polymer system on the temperatures of the final (supercooled) and initial states of the system is analyzed. The calculated indices of the exponent values of height increase and the position of the G(q, t) peak at intermediate times agree well with the computer simulation data obtained by other authors for the corresponding stochastic equations of the local order parameter relaxation.