Wi-Fi　imaging　achieves　object　perception　in　the　form　of　images　by　analyzing　Wi-Fi　signals　and　their　channel　response.　To　solve　the　modeling　problem　of　Wi-Fi　imaging,　a　method　based　on　Wi-Fi　electromagnetic　diffraction　tomography　is　proposed.　Firstly,　the　Wi-Fi　communication　system　is　mathematically　modeled,　which　contains　a　channel　model　and　channel　state　information(CSI)　indicator,　and　the　CSI　matrix　of　the　Wi-Fi　system　is　highlighted.　Secondly,　the　electromagnetic　diffraction　tomography　physical　model　and　its　mathematical　principles　are　analyzed,　and　the　imaging　algorithm　is　proposed.　Then　the　hardware　platform　of　the　system　was　built,　and　the　software　modification　and　debugging　were　carried　out.　Finally,　the　CSI　was　acquired　by　this　hardware　system,　and　this　data　was　processed,　including　the　removal　of　outliers,　noise　reduction,　and　phase　correction,　and　subsequently　reconstructed　into　a　clearer　contour　map　by　the　Wi-Fi　electromagnetic　diffraction　tomography　algorithm.　©　2024　IEEE.