A　one　dimensional　coordination　polymer,　[(C7H18N)　(Ag2I3)]n　((C7H18N)　+=Methyltriethylammonium)　has　been　successfully　synthesized　and　characterized　by　X-ray　single-crystal　diffraction　method.　Structure　analysis　shows　that　the　compound　consists　of　organic　cations(Methyltriethylammonium)　and　inorganic　anion　chains　(Ag2I3)n-.　The　inorganic　moiety　consists　of　AgI4　tetrahedron,　which　shares　the　same　edges　with　adjacent　AgI4　tetrahedrons　to　form　one-dimensional　infinite　double　chains　along　a-axis.　There　exists　weak　interaction　among　Ag⋯Ag　atoms　in　the　crystal.　Anion　chains　are　surrounded　by　Methyltriethylammonium　cations.　Anion　chains　and　cations　are　in　combination　with　each　other　by　static　attracting　forces　in　the　crystal　to　form　so-called　organic-inorganic　hybrid　structure.　According　to　the　crystal　structure　data,　quantum　chemistry　calculation　with　DFT　on　B3LYP　level　was　used　to　reveal　the　electronic　structure　of　title　compound.　CCDC:　254288.