In　order　to　reduce　the　noble　metal　palladium　dosage　in　the　preparation　of　CL-20　so　as　to　reduce　its　production　cost,　several　carbon　supports　were　prepared　successfully　using　the　hydrothermal　carbonization　method　in　the　absence　or　presence　of　urea　using　microcrystalline　cellulose　(MC)　as　the　carbon　source,　and　the　corresponding　Pd(OH)(2)/C　catalysts　were　fabricated　using　the　deposition-precipitation　method,　which　showed　high　activity　in　the　debenzylation　reaction　of　hexabenzylhexaazaisowurtzitane　(HBIW)　and　tetraacetyldibenzylhexaazaisowurtzitane　(TADB).　It　was　found　that　all　the　catalysts　showed　a　high　efficiency　in　the　debenzylation　of　HBIW,　indicating　that　the　structure　of　the　used　carbon　supports　had　a　limited　impact　on　the　catalyst　performance　in　this　reaction.　On　the　contrary,　the　activities　of　the　catalysts　in　the　debenzylation　of　TADB　were　quite　different.　The　results　of　the　nitrogen　sorption　isotherm　measurement　(BET),　scanning　electron　microscope　(SEM),　scanning　transmission　electron　microscopy　(STEM),　powder　X-ray　diffraction　(XRD),　element　analysis　and　temperature　programmed　desorption　(TPD),　as　well　as　X-ray　photoelectron　spectra　(XPS)　characterizations　of　the　supports　and　catalysts,　showed　that　the　relatively　high　activity　of　Pd/HTC　in　the　debenzylation　of　TADB　was　related　to　the　high　Pd　dispersion　and　novel　mesoporous　structure,　while　the　further　higher　activity　and　stability　of　Pd/HTC-N-1:1　in　the　same　reaction　were　related　with　its　high　Pd　dispersion,　high　total　oxidized　Pd　species,　and　high　surface　pyridinic　N　contents　as　well　as　the　eggshell　distribution　of　Pd　species　on　the　support.