With　the　rapid　development　of　robotics　technology,　it　has　become　crucial　for　robots　to　effectively　perceive　the　sense　of　touch.　This　helps　intelligent　robots　better　understand　their　surroundings,　improves　their　perception　and　interaction　capabilities,　and　is　directly　related　to　the　robot＇s　motion　decision-making　and　human-robot　interaction　safety.　Electrical　impedance　tomography　is　a　non-invasive　medical　imaging　technique　that　can　reconstruct　the　conductivity　distribution　of　a　conductive　domain　using　a　small　amount　of　boundary　voltage　data.　It　demonstrates　the　unique　advantages　of　large-area　tactile　sensors　for　human-computer　interaction.　In　this　paper,　we　present　a　tactile　sensor　system　based　on　electrical　impedance　tomography.　A　robotic　arm　sensor　with　16　electrodes　was　designed　and　prepared　using　3D　printing　technology,　a　data　acquisition　hardware　system　and　an　upper　computer　image　reconstruction　software　system　were　built.　The　sensor　was　applied　to　the　robotic　arm　as　an　＇electronic　skin＇,　and　several　physical　interaction　experiments　were　conducted.　The　experimental　results　show　that　the　sensor　is　of　great　significance　in　realizing　the　tactile　sensing　function　of　robots　and　human-computer　interaction.　©　2023　IEEE.