Abstract:Gaoyou503" was a product of distant hybridization with couch grass (Elytrigia elongata) using chromosomal engineering and traditional breeding methods. It has many good characters such as high and reliable yields, good resistance to adversity and nice applicability. It passed the examination and approbation of Crops Examine and Approve committee both Shannxi province in 1997, and Hebei province in 1998. In 1999, it got the recognize of Xinxiang city, Henan province as well. It won the first class subsidy from China Agriculture Department in 1998. Now there are totally 14 cities and provinces all over the country, which have introduced Gaoyou503. It is surveyed, only in three provinces including Hebei, Henan and Shannxi, that it has been planted 12.65 million mu and increased agricultural income 0.8 billion yuan altogether. "Gaoyou503" got the first class scientific technology development prize of Chinese Academy of Sciences.