Polyethers eould form hydroperoxide under air-oxidation or photooxidation in the presence of H2O2．The scission of ether linkages induced by moderate oxidation was prevented by controlling the reaction time and hydroperoxide concentration．The oxi-dation rate was affected by the end group S of polyethers．The decreasing order of oxidation rate for various poly (oxytetramethylene) derivatives having different end groups are as follows：poly (oxytetramethylene) glycol (PTMG)> poly (oxtetra-me thylene)acetate(PTMGAC)>poly(oxytetramethylene)phenylamino formate (PTMGPIC)．The urethane end groups in PTMGPIC increase the resistance toward oxidation．Polyether hydroperoxide reacts with ferrous ion or N，N-dimethyl-p-tollli-dine (DMT) to form polymeric·oxy radical which then initiates the graft copolymeri-zation of vinyl monomers at low temperature，and was devoid of homopolymerization．The eopolymer after separation and purification was proved to be a graft one by IR analysis and elemental analysis．