Polyether polyol (abbreviated as polyether) is an organic polymer, which is composed of initiator (compound containing active hydrogen group) and ethylene oxide (EO), propylene oxide (PO), butylene oxide (BO) and so on in the presence of a catalyst through addition polymerization. The largest polyether output is glycerol (glycerol) as the initiator and epoxide (generally PO and EO are used together), by changing the feeding method of PO and EO (mixing or separate addition), addition ratio, Adding order and other conditions, produce various general polyether polyols.