Discusses the basic data of four pyridine extraction fractions, PM 1 , PM 6 , PM 7 and PM 8 , from Pingshou bituminous coal obtained by ultimate analyses, mean molecular weight measure, GC/MS, 1 3 C NMR, H NMR and FTIR techniques. A method calculating the average molecular parameters of the fractions is introduced. Molecular structure models of the fractions of PM 6 , PM 7 and PM 8 are constructed based on the calculated parameters.