Intra-body　communication　(IBC)　is　a　technique　to　transmit　electric　signal　through　the　on-body　and　implanted　sensors　by　means　of　the　conducting　properties　of　the　human　body.　This　technique　could　be　an　innovative　networking　method　for　sensors　on　the　human　body　and　sharing　information　among　the　devices　scattered　across　the　human　body.　To　analyze　the　characteristics　of　human　data　channel,　we　devise　a　quantitative　measurement　system　that　can　provide　a　quantitative　current　in　the　transmitter　and　a　qualitative　analysis　in　the　receiver.　The　transmitter　of　the　system　includes　a　current　driving　circuit　with　an　amplifying　and　filtering　circuit　in　receiver.　By　testing　performance　of　the　system　and　conducting　in-vivo　experiments　with　the　proposed　measurement　system,　the　physical　characteristic　of　human　data　channel　was　studied.　Experimental　results　show　that　the　human　body　has　a　stable　propagation　characteristic　in　the　frequency　range　from　1　kHz　to　100　kHz,　and　the　potential　gain　characteristics　approximate　to　a　high-pass　filter.　©　2012　IEEE.