优Ⅰ６６是中国水稻研究所用印水型不育系优ⅠＡ与早籼恢复系６６配组选育而成的籼型杂交早稻新组合。该组合具有产量高、抗稻瘟病、米质优、制种易获高产、适应性广等特点，适宜在长江以南各省和桂北、粤北、闽北作双季早稻种植。１９９７年３月通过江西省品种审定委员会审定 You Ⅰ66 is a new indica hybrid rice combination developed by China National Institute of Paddy Rice with the combination of ABA and indica restorer line 66. The combination has the characteristics of high yield, resistance to rice blast, high quality of rice, easy yielding and high adaptability of seed production, and is suitable for double-season early rice planting in the provinces south of the Yangtze River and in northern Guangxi, northern Guangdong and northern Fujian. March 1997 through the Jiangxi Provincial Examination and Approval Committee