In this paper, we recall the main results obtained in Raman scattering on polyacetylene (CH)x, cis or trans, and we concentrate on the experimental point of view. New results are presented, essentially coming from the use of new excitation wavelengths, in the deep red region (λL = 752.5 nm), and in the U.V. range (λL = 333.6 nm). These results will be discussed with the use of the theoretical models proposed by other authors