Abstract:The inbred line Luyuan 92, which was bred by irradiation technology and conventional method, is with many good traits, such as high combining ability, strong stress resistance, high yield and good agronomical charactors. It is one of the key inbred lines in China. 19 varieties bred using Luyuan 92 directly or indirectly had been passed national or provincial approval. According to the incomplete statistics of seed management departments in some provinces, the varieties from Luyuan 92 had been planted 5.2×106 hm2, the economic benefit reached RMB 18.82×108 till 2008.