The two postprocessing methods distilled under negative pressure and extraction were studied with the rude products of hydroxy terminal polyepoxy chloropropane (CTP),azido polyethers (ATP) and highmolecularweight azido polyethers (HATP) as the postprocessing thing. Results show that it is very difficult to get rid of cyclic crown ether and lowmoleculeweight oligomer by distillation under negative pressure. But extraction can get ideal postprocessing result. Isopropyl alcohol, petroleum ether (60-90 ℃) and the mixed solvent (mixed by isopropyl alcohol and petroleum ether) were chosen as extraction solvents. Extraction results indicate: (1) The extracting power of three extracting agents is in proper order: the mixed solvent＞isopropyl alcohol＞petroleum ether; (2) Isopropyl alcohol extracts lowmoleculeweight polyols preferably,and petroleum ether extracts cyclic crown ether preferably,while the mixed solvent has two extraction results at the same time; (3) For the rude products of CTP,ATP and HATP,the number average molecularweight (Mn) and functionality (f) can be increased after extraction by the mixed solvent. For HATP,Mn can be increased from 2500-3200 to 3000-4000; f can be increased from 1.99-2.00 to 2.46-2.97; the content of lowmoleculeweight oligomer can be decreased from 4.1%-8.2% to 0.3%-2.3%.