Intra-Body　Communication　(IBC),　which　modulates　ionic　currents　over　the　human　body　as　the　communication　medium,　offers　a　low　power　and　reliable　signal　transmission　method　for　information　exchange　across　the　body.　This　paper　first　briefly　reviews　the　quasi-static　electromagnetic　(EM)　field　modeling　for　a　galvanic-type　IBC　human　limb　operating　below　1　MHz　and　obtains　the　corresponding　transfer　function　with　correction　factor　using　minimum　mean　square　error　(MMSE)　technique.　Then,　the　IBC　channel　characteristics　are　studied　through　the　comparison　between　theoretical　calculations　via　this　transfer　function　and　experimental　measurements　in　both　frequency　domain　and　time　domain.　High　pass　characteristics　are　obtained　in　the　channel　gain　analysis　versus　different　transmission　distances.　In　addition,　harmonic　distortions　are　analyzed　in　both　baseband　and　passband　transmissions　for　square　input　waves.　The　experimental　results　are　consistent　with　the　calculation　results　from　the　transfer　function　with　correction　factor.　Furthermore,　we　also　explore　both　theoretical　and　simulation　results　for　the　bit-error-rate　(BER)　performance　of　several　common　modulation　schemes　in　the　IBC　system　with　a　carrier　frequency　of　500　kHz.　It　is　found　that　the　theoretical　results　are　in　good　agreement　with　the　simulation　results.