Abstract: To meet the market requirement for high-yield and high-density resistance maize, the new maize variety‘Shengrui 999’was bred using‘Sheng 68’as female parent and‘Sheng 62’as male parent. In 2011- 2012 Huanghuai summer maize regional trial, the average annual yield was 10035.7 kg/hm2, which was 6.3% higher than that of the control‘Zhengdan 958’. In 2012 Huanghuai summer maize production trial, the average yield was 10336.5 kg/hm2, which was 7.1% higher than that of the control‘Zhengdan 958’. In 2013, the variety was approved by the Henan Provincial and National Crop Variety Approval Committee, its main features are high yield and stability, outstanding lodging resistance, high- density resistance and superior quality, and it is suitable for being planted in summer in Henan, Shandong, Baoding and the south of Hebei, Guanzhong Irrigation District of Shaanxi, northern Jiangsu, northern Anhui and southern Shanxi.