Intra-body　Communication　(IBC)　is　an　emerging　and　interesting　communication　technique　in　recent　years.　The　research　and　promotion　of　this　technique　is　to　simplify　the　communication　network　of　telemedicine　system,　wearable　device,　as　well　as　implantable　devices.　Utilizing　the　conductive　property　of　human　body,　IBC　employs　human　body　as　communication　medium　for　transmitting/receiving　electrical　signals.　As　a　result,　abundant　of　interconnected　cables　and　electromagnetic　interference　can　significantly　be　reduced　for　telemedicine　system　and　IBC　can　provide　an　alternative　solution　for　realizing　the　communication　with　implantable　devices.　In　this　paper,　the　authors　propose　a　quasi-static　mathematical　model　for　galvanic　coupling　type　IBC.　This　model　attempts　to　provide　insight　of　transmitting　electrical　signal　through　human　body　and　forms　a　basis　for　developing　IBC　applications.　Finally,　experimental　measurements　are　conducted　for　validating　the　correctness　of　the　model.