Polyether polyols, as the key raw materials of polyurethane, are classified into various categories and meet the needs of a wide range of fields. According to the use is mainly divided into hard bubble, soft bubble, CASE (coating, adhesive, sealant, elastomer), POP and special polyether. Hard foam polyether is suitable for insulation materials such as refrigerator insulation; Soft foam polyether is used for furniture and mattress, emphasizing comfort; CASE class improves the performance of coatings and adhesives; POP polyether in personal care; Special polyethers meet unique requirements. Based on differences in initiator, functionality and molecular weight, polyether polyols show diversity to meet the customized needs of different industries.