The　interconnetion　network　plays　an　important　role　in　a　parallel　system.　To　avoid　the　edge　number　of　the　interconnect　network　scaling　rapidly　with　the　increase　of　dimension　and　achieve　a　good　balance　of　hardware　costs　and　properties,　this　paper　presents　a　new　interconnection　network　called　exchanged　3-ary　n-cube　(E3C).　Compared　with　the　3-ary　n-cube　structures,　E3C　shows　better　performance　in　terms　of　many　metrics　such　as　small　degree　and　fewer　links.　In　this　paper,　we　first　introduce　the　structure　of　E3C　and　present　some　properties　of　E3C;　then,　we　propose　a　routing　algorithm　and　obtain　the　diameter　of　E3C.　Finally,　we　analyze　the　diagnosis　of　E3C　and　give　the　diagnosibility　under　PMC　model　and　MM*　model.