Ⅱ优航1号是应用航天育种方法育成的超级杂交水稻新组合。2003—2005三年推广面积为26.67万hm2，累计增产粮食1.2亿kg。该组合具有产量潜力高、米质较优、苗期耐寒性较好、抽穗期耐高温、穗大粒多、结实率高、适应性广、再生力强等特点。2004年通过福建省品种审定，2005年通过全国品种审定和广西区品种审定，被农业部列为全国重点示范推广的超级稻组合之一，还被福建省农业厅列为重点示范推广超级杂交稻组合。着重介绍Ⅱ优航1号的推广应用，主要植物学特征与产量结构，同时也介绍了它在各级区域试验、生产试验、6.67、66.67、666.67hm2高产示范片的产量表现和抗性、品质特性。

“IIYouhang No.1” is a new variety by the Space-Flight. The cultivated area of“II Youhang No.1” is 266,700 hm2 from 2003 to 2005, the total yields were about 120 million kg in three years. Its characteristics was super-high yield, high quality, cold tolerance in seedling stage, high temperature tolerance at heading stage、large panicles、more spikelets, high setting rate, wide adaptability and strong ratoon ability. It was registered in Fujian province Crops Variety Approval Committee and the National Crops Variety Approval Committee in 2004 and 2005 respectively, and approved in Guangxi province in 2005. It was one of those super-hybridization varieties (combinations) to be demonstrated and extended in national wide and Fujian province. The extension and application, botanical traits and yield components of “II youhang No.1” have been summarized in this paper, and its yield, resistance and quality in provincial trials, producing trials and high yield demonstration under an area of 6.67、66.67、666.67 hm2 also have been introduced.