Abstract: The spatial and temporal distribution characteristics and pollution contribution of seawater quality near the offshore oil and gas exploration zone in the Bohai Sea were analyzed by combining the methods of principal component comprehensive evaluation, correlation analysis, and spatial visualization based on the monitoring results of surface seawater pollution factors near 14 offshore oil and gas exploration zones in the Bohai Sea from 2015 to 2020. The results revealed that the seawater quality near the offshore oil and gas exploration zone in the central Bohai Sea was better than in Liaodong Bay and Bohai Bay. The comprehensive evaluation results of seawater quality near No.1 offshore oil and gas exploration zone at the top of Liaodong Bay were the worst, while the results near No.4 offshore oil and gas exploration zone at the mouth of Liaodong Bay were the best, which could be attributed to the significant influence of land-based inputs and hydrodynamic conditions near No.1 offshore oil and gas exploration zone. Furthermore, in comparison to mercury (Hg), land-based input had a significant impact on the levels of chemical oxygen demand (COD), petroleum, and cadmium (Cd). Pollutants discharged from oil and gas platforms contributed little to the pollution elements in the surface seawater near the offshore oil and gas exploration zone in the Bohai Sea, and COD and petroleum fluxes into the sea were less than 0.02% and 6% of the land-based inputs, respectively, while Hg and Cd were far less than 7% and 3% of the land-based inputs, respectively.