Abstract: Based on the data such as the number and types of ships in Guangxi, and the power of ship engines, taking Guangxi Zhuang Autonomous Region as an example, the ship engine power method was used to establish the 2020 Guangxi inland and coastal ship emission list, and to explore the spatial distribution of the main air pollutant emissions from inland and coastal ships in Guangxi in 2020. The impact of ship air pollutant emissions on the atmospheric environment of Guangxi coastal port areas was simulated using an atmospheric diffusion model. The results showed that the dry cargo ships contributed 35.6% of the emissions from inland vessels, while the fourth-class ships accounted for 26.07% of the emissions. The contribution of tugboat emissions to coastal ships was 44.16%-49.33%, with emissions from main engines, auxiliary engines, and boilers being 52.39%, 21.43%, and 26.18%, respectively. Under different operating conditions, Coastal ship berthing conditions account for the highest percentage of SO₂ emissions, while for other pollutants the highest emissions were observed in slow-driving conditions. In 2020, the average emission intensity of SO₂, NO_x, HC, and CO₂ from ships in Beibu Gulf of Guangxi was 0.32, 2.14, 0.07, 121.93 t/km², respectively.