Abstract: New variety Shaan 512 , released by College of Agronomy,Northwest Sci-Tech University of Agriculture and Forestry in 2001 from the cross of Shaanmai 150 Ms2(♀) and Shaan 354 (♂) in 1997 field and through breeding method of recurrent selection and pedigree, examined and approved by crop approve committee Of Shaanxi Province in Sept. 2004, Since its well growing ,high yield, large kernel, high appearing commodity , medium-strong gluten, palatable property, high pathological resistance, high tolerance to hot drought and spike-spout, was chosen as unified provision variety to farmers by many seed companies, spread widely and rapidly ,It shows recurrent selection is useful method to solve coordination among yield components and yield、quality、resistances on higher level