Intrabody　communication　(IBC)　is　a　promising　approach　for　realizing　information　transmission　among　various　wearable　or　implantable　devices　within　bodyNET.　The　existing　IBC　studies　are　limited　to　the　local　or　abstract　geometric　channel　model,　which　is　limited　to　providing　efficient　channel　characteristics　for　the　various　transmitting　scenarios.　The　aim　of　this　article　is　to　reconstruct　a　whole-body　model　with　anatomical　features　and　combine　the　field-circuit　model　for　investigating　the　human　channel　characteristics.　A　visible　human　data　(VHD)　is　established　by　segmentation　and　3-D　reconstruction　of　layered　tissues.　The　transmission　attenuation　was　simulated　and　analyzed　through　the　finite　element　method.　In　vivo　experiments　and　phantom　experiments　were　implemented　to　validate　the　simulation　results.　For　the　on-body　communication,　the　transmission　attenuation　of　the　short　distance　was　similar　to　the　low-pass　filter＇s　amplitude-frequency　characteristics.　For　the　implantable　communication,　the　consistency　coefficient　of　the　attenuation　between　in-body　to　on-body　and　on-body　to　in-body　was　higher　than　98%,　indicating　that　the　body　channel　is　bidirectional.　This　work　provides　a　repeatable　and　verified　VHD-based　whole-body　model　for　the　human　channel　attenuation　investigation.　It　is　an　essential　step　for　the　further　development　of　IBC,　such　as　the　transceiver　design　and　the　multinodes＇　protocol　for　bodyNET.　©　1963-2012　IEEE.