Double metal cyanide catalysts containing polyester for preparing polyether polyoles

The invention relates to a novel improved for preparing the polyether polyhydric alcohol's bimetallic catalyst cyanide; the polyether polyhydric alcohol wheel to prepare comprises a driving hydrogen atoms precursor composite on a alkylene oxide cover, wherein the catalyst comprising a duplex-metal cyanide and organic complexing ligand and 5-80% (a) of the polyester (based on catalyst) are. The novel improved catalyst is used for preparing polyether and when polyhydric alcohol, having reduced the upper circle and considerably of activeness.