By applying the method of gas diffraction analysis, the theoretical intensity curves for the three halos obtained from thin films of highly polymerised organic substances by electron diffraction, are calculated. They account successfully for the observed maxima. By deviding a large number of interatomic distances into three appropriate groups and by means of partial use of the integral form in place of the usual summation form, a good agreement of curves with observations can be obtained while such simple model as a glucose or a cellobiose unit of cellulose can not give satisfactory results