Abstract: Port regional emission has become an important factor affecting the environmental air quality of coastal port cities in China. Port low emission area is one of the important measures to control port pollution. China's port pollution control started late, but with the introduction of a series of policies, laws and regulations, it laid a solid foundation for comprehensively promoting the prevention and control of vessel and port pollution. The establishment of port low emission area has become a new and important measure for some countries and regions to solve the problem of port air pollution. In a China southern city, port area emission has become an important local air pollution source. From large to small, the contribution rate of all kinds of pollution sources in this port is ocean going vessel, transportation vehicles, inland vessel and operation machinery. By calculating the PM_2.5 equivalent of pollutant emission, it can see that after the implementation of the port low emission area scheme, the reduction of particulate matter is 1.2 times of the required emission reduction. Although China's port pollution control has achieved some results at present, it still needs to strengthen regional cooperation and policy support to further promote port pollution control. At the same time, the management experience of other countries in low-row areas of ports is also worth learning, which is beneficial to ensure the implementation of port pollution control plans.