The　Magnetic　Resonance-Coupled　Human　Body　Communication　(MR-HBC)　method　presents　advantages　such　as　high　path　gain　and　enhanced　information　security,　rendering　it　particularly　suitable　for　establishing　wireless　body　area　networks.　The　optimal　operation　of　MR-HBC　relies　on　functioning　at　resonance　frequency.　However,　owing　to　the　intricate　dielectric　properties　of　human　tissues　and　individual　differences,　the　resonance　frequency　of　communication　systems　frequently　experiences　varying　degrees　of　deviation.　To　delve　into　the　intrinsic　mechanism　behind　frequency　shifts,　this　paper　establishes　a　finite　element　model　based　on　the　genuine　dielectric　properties　and　geometric　structure　of　the　human　body.　It　investigates　the　augmentation　effects　of　human　tissue　on　MR-HBC,　examines　the　influence　of　distinct　tissue　electrical　properties　on　the　electromagnetic　field　distribution　of　MR-HBC,　and　analyzes　the　inherent　connection　between　frequency　shifts　and　human　tissue　electrical　characteristics.　The　results　reveal　that　the　electrical　properties　of　human　tissues　stand　as　the　primary　factor　affecting　frequency　shifts,　with　the　extent　of　frequency　deviation　contingent　upon　the　proportional　composition　of　different　tissues.　©　2023　IEEE.