Abstract: In order to cultivate new maize varieties with stable yield and suitable mechanical harvesting suitable for planting in tropical and subtropical regions of southern China, a germplasm improvement population was constructed based on tropical germplasm and supplemented by temperate germplasm, and maize inbred lines suitable for Guangxi ecological environment were created and combined. A new maize variety Guidan 902 was bred through years of multi-point identification. In the spring and autumn regional test of 2018, the average yield was 7 719.00 kg/hm², 5.80% higher than that of the control; the average yield of the production test in spring and autumn of 2019 was 7 138.00 kg/hm², 7.70% higher than that of the control. It was susceptible to sheath blight, northern and southern leaf blight,resistant to southern rust, and moderately resistant to Fusarium ear rot and Fusarium stem rot. The bulk density,crude protein, crude fat and crude starch of Guidan 903 were 758.00 g/L、10.21%、4.12%、72.55% separately. The test lodging rates in 2018—2019 were 5.30% and 0.40% separately, and the discount rates were 0 and 0.50%, separately. Guidan 902 has a high and stable yield, which meets the requirements of mechanized harvesting in Guangxi and can be planted in the whole Guangxi Zhuang Autonomous Region.

Key words: maize, new variety, Guidan 902