Abstract: Guidan 669, a new maize variety, was bred by Maize Research Institute, Guangxi Academy of Agricultural Sciences. Its parents were Q901as female parent and P508 as male parent. In 2018, the regional test of Guidan 669 was conducted in Guangxi, and the average yield in spring and autumn was 520.7 kg/667 m², 6.0% higher than the control variety Guidan162. In 2019, the production test of Guidan 669 was conducted in Guangxi, and the average yield in spring and autumn was 478.7 kg/667 m², 8.3% higher than the control variety. Guidan 669 was examined and approved by the Crop Seed Approval and Examination Committee of Guangxi in 2020. Guidan 669 has high and stable yield, good quality, lodging resistance and wide adaptability, which was suitable for planting in Guangxi.

Key words: tropical maize, Guidan 669, breeding, cultivation technique