A new Japonica rice variety ”Tainan 11” was released by Chiayi Branch Station of the Tainan District Agricultural Research and Extension Station in Nov, 2004. This variety was selected from the cross between Taikeng yuh 69223 and Taikeng 16 made in the 2nd crop 1997. Its breeding line was named ”Nankeng yuh 58”, selected out when it was F4, 2nd crop 1999. The preliminary, advanced and the regional yield trials, as well as other screen testing of this line were conducted between the 1st crop 2000 and the 1st crop 2004. After evaluation by the Committee of Registration for New Rice Varieties of the Council of Agriculture, ”NanKeng yu 58” was finally named as ”Tainan 11” in Nov, 2004. This medium to late maturing variety is characterized with the merits of good grains qualities both in its appearance and eating, high head rice ratio, high yielding, moderate resistance to rice blast, moderate or high resistance to planthoppers, lower shattering and anti-lodging.