Abstract: Based on the monitoring data of pollution sources directly discharged into Bohai Sea from 2011 to 2020, this paper analyzes the emission status and trend of pollution sources directly discharged into Bohai Sea, understands the effectiveness and shortcomings of pollution sources directly discharged into sea in the comprehensive management of the Bohai Sea, and puts forward corresponding management countermeasures. The results show that: from 2011 to 2020, the discharge of pollution sources directly discharged into Bohai Sea has been at a low level compared with the Yellow Sea, the East China Sea and the South China Sea, and the chemical oxygen demand, ammonia nitrogen, total phosphorus and other pollutants have increased first and then decreased. Since the implementation of the comprehensive management of the Bohai Sea in 2018, the total amount of sewage into the sea from the pollution sources directly discharged into sea has increased significantly, but the total amount and concentration ratio of chemical oxygen demand, total phosphorus, total nitrogen and other major pollutants have decreased significantly. The compliance rate of pollution sources directly discharged into sea has increased year by year. In terms of spatial distribution, Shandong and Liaoning belong to the provinces with high pollution emission and emission intensity of direct discharge sea. In terms of time distribution, the emissions of pollution sources directly discharged into sea such as chemical oxygen demand, total nitrogen, total phosphorus and ammonia nitrogen showed a significant upward trend in the fourth quarter of 2018 － 2020. Combined with the emission characteristics of pollution sources directly discharged into sea, it is suggested that the control system of pollution sources directly discharged into sea should be improved, the precise regulation of pollution sources directly discharged into sea should be promoted by classification, and the monitoring capacity of pollution sources directly discharged into sea should be improved, so as to provide support for the in-depth treatment of pollution sources directly discharged into Bohai Sea.