Abstract: 【Objective】Xiangliangyou 900 is a new super-high-yield variety bred by China National Hybrid Rice R&D Center (Hunan). Xiangliangyou 900 has the characteristics of strong stem, high spike rate and high seed setting rate of large grain and large panicle. In 2017, the effects of yield and agronomic traits of Xiangliangyou 900 were investigated under different density population with high-yield cultivation condition in Huiyang district, Huizhou city, Guangdong Province. 【Method】 In this study, split blocks were designed in the field. The planting density was from 13 cm×13 cm to 24 cm×24 cm with single or multiple plants. The yield and agronomic traits were evaluated based on the data obtained in the field and indoor. The data was sorted out by Microsoft Excel and the variance analysis was performed by DPS data processing system.【Results】 The results showed that, under the condition of super-high-yield cultivation of hilly paddy soil in the Pearl River Delta Region, Xiangliangyou 900 had the highest yield under the planting density of 19 cm×19 cm among all treatments. At the same time, Xiangliangyou 900 also had the highest effective panicle number, total grain number per panicle, seed setting rate and total biomass. 【Conclusion】 Xiangliangyou 900 can obtain higher yield in the one-season middle rice area based on its yield potential with long growth period. Xiangliangyou 900 with thick stem takes up more space and is not sensitive to the number of planting seedlings. Therefore, Xiangliangyou 900 will obtain higher yield under sparse planting condition.