Tainan No. 17 is a single-cross hybrid corn and was coded as Nanyu PS 53 before registration. Its maternal line, Antigua-2-44-1, was derived from a tropical composite and paternal inbred, P 3184-1-3-1, was originated from a temperated synthetic variety. Since being selected out in 1985, Nanyu PS 53 had been recommended to joint in regional yield trial, plant density and nitrogen fertilizer test, reaction to various economic important disease and insect pests test, high soil moisture tolerant test and large-seal cultivation demonstration. The data collected from the above tests revealed that Nanyu PS 53 is characterized with high-yielding ability, highly lodging resistance, moderate resistance to MDMV and stalk rot and with moderate tolerant to high soil moisture. After evaluation by the Committee of Registration for new crop cultivar convened by the Department of Agriculture and Forestry. Taiwan Provincial Government, Nanyu PS 53 was finally named as Tainan No. 17 in December 1987. Tainan No. 17 is a medium late variety and has a wide adaptation characteristic, It is suitable to cultivate in Taichung, Changhua and Yuin-Chia-Nan Areas.