Abstract: In this study, investigation was made on the current situation of three-dimensional greening of Bougainvillea on overpasses and viaducts in many cities in South China. The statistics and analysis were mainly carried out from the following aspects: substrate, pot containers, Bougainvillea varieties, steel structure design, irrigation and drainage equipment and the flowering period regulation of Bougainvillea. The purpose was to find the best greening technology aspects. Some suggestions were put forward for the future three-dimensional Bougainvillea greening on overpasses and viaducts in Southern cities in China.