Tainan No.1 is a hybrid cucumber variety which its original breeding code was YC-04 in combining test, comparison test and performed regional yield trial and it was released in 2010 by Tainan DARES. The main characteristics of Tainan No.1 are as follow:1. Tainan No.1 is a variety with gynoecious lines and parthenocarpy character.2. The fruit skin color is emerald with gynoecious lines and parthenocarpy character.3. The fruit length is 22~23 cm fruit average weight about 90~100 g, yield about 6 ton/ha.4. The variety is a powdery mildew tolerance variety so it fit soil and soilless cultures for simple greenhouse or net house.