Four new polymeric crown ethers (I，II，III，IV) were synthesized via direct cyeli-zation of poly-β-ehloroethyl glyeidyl ether with disodium polyethylene glycols[H-(-OCH2·CH2)m OH，m=1，2，3，4] The cation-complexing ability and catalytic activity of these polymeric crown ethers have also been investigated．These polymers，especially polymer (II) are effective phase transfer catalysts in WoIff-Kishner reaction，such as the for-mation of diphenylmethane from diphenylketone hydrazone，and in the halogen exchange reaction i.e．the transformation of bromooctane to iodooctane by KI．The activity of poly-mer (II) is comparable with that of dibenzo-18-crown-6 and 18-crown-6．These polymers can be easily recovered by simple filtration and reused． For Wolff．Kishner reaction the polymer (II) could be reused twice without remarkable loss of activity．But in the ease of the halogen exchange reaction

the recovered catalyst exhibited low activity．