The　virtual　instrument　platform　that　has　the　merits　of　programming　intuitively,　rapid　development　and　being　easy　to　modify　was　introduced　in　this　article　to　study　the　characteristics　or　performances　of　galvanic　coupling　intra-body　communication.　Then,　the　channel　capacity　of　galvanic　coupling　intra-body　communication　under　10cm　body　channel　was　estimated　with　Shannon　theorem.　In　addition,　the　function　of　modulation　and　demodulation　of　real　intra-body　communication　system　had　been　simulated　by　the　way　of　data　acquisition　and　LabVIEW　programming　to　validate　its　feasibility　in　the　communication　system.　What＇s　more,　the　method　of　data　acquisition　and　LabVIEW　programming　could　play　the　role　of　modulation　and　demodulation　in　practical　intra-body　communication　system,　and　which　meant　that　it　was　feasible　to　apply　the　way　to　the　communication.　Moreover,　according　to　the　characteristics　of　body　channel,　FSK　would　be　much　more　suitable　for　intra-body　communication　system　than　other　two　ones.