Abstract: Palladium hydroxide catalysts play a key role in the preparation of hexanitrohexaazais- owurtzitane (CL-20).Eight kinds of Pd(OH)₂/CeO₂ catalysts，for which two kinds of CeO₂ are used as catalyst support，were prepared by deposition-precipitation method. The effects of the preparation temperature，immersion time，the kinds of alkali，pH and the structure of support on the catalytic performance of Pd(OH)₂/CeO₂ are investigated.Pd(OH)₂/CeO₂ catalysts exhibit excellent catalytic activity in the hydrogenolytic debenzylation reaction of both hexabenzylhexaazaisowurtzitane (HPIW) and tetraacetyl-dibenzyl-hexaazaisowurtzitane(TADBIW)，and the yields of products can reach 91% and 95%，respectively.When the amount of Pd used in catalyst is 0.10% (wt/wt) of HBIW substrate，the yield of TADBIW reachs 91%.When the amount of Pd is 0.28%（wt/wt）of TADBIW substrate，the yield of the product is as high as 87%.In this research，a small amount of Pd catalyst is used to efficiently catalyze the hydrogenolytic debenzylation reaction of HBIW and TADBIW，which broadens the way for low-cost preparation of CL-20.

Key words: palladiumcatalyst, catalystsupport, hydrogenolyticdebenzylation, hexabenzylhexaa-zaisowurtzitane, tetraacetyl-dibenzyl-hexaazaisowurtzitane