Abstract: Fully deuterated polyethylene foam has higher D/C ratio and is urgently in ICF. Deuterated polyethylene foam has been fabricated at the first time by thermally induced phase separation technique and freeze drying technique. The structural morphology of the perdeuterated foam is charactered by SEM, showing its density to be 20-60 mg/cm³, corresponding to the mean pore size of 0.2-10 μm. The results of characterization by solid ¹ H NMR and TG, show that the foam has a good thermal stability and a dependable deuteration ratio.