Polyether polyol (polyether for short) is an organic polymer, which is prepared by the addition polymerization of initiator (compound containing active hydrogen group) and ethylene oxide (EO), epoxy butane (Bo), propylene oxide (PO) in the presence of catalyst. The largest output of polyether is glycerol (glycerol) as initiator and epoxide (generally Po and EO are used together). Various general polyether polyols are produced by changing the feeding mode (mixed or separate), dosage ratio and feeding order of Po and EO.