Abstract: The nutrient content in water and sediment are high in Daihai Lake, and the trophic status is increasing in recent years, as well as the high release risk of endogenous pollutants. The phosphorus sorption kinetic and sorption isotherm characterization of the sediments from southwest, northeast, and center regions in Daihai Lake was analyzed, and the role of 'source-sink' in sediment from three regions was clarified according to the calculation of native adsorbed phosphorus (NAP) and equilibrium phosphorus concentration (EPC₀). The results indicated that: (1) The pseudo-second order could better describe the phosphorus sorption kinetic characterization, and the sediments had the sorption equilibrium within 8 h with the high sorption rate (the highest value of 11.45 g/(mg·min)). (2) The sediments in the center region of Daihai Lake had the high sorption capacities (0.867 mg/g), and the modified Langmuir sorption isotherm model could describe the phosphorus sorption well (R² was 0.9076-0.9742). (3) Comparing the NAP content, the sediment EPC₀ and the value of soluble reactive phosphorus (SRP) in the interstitial water, the sediments form the center region of Daihai Lake had the high Phosphorus release risk, while the sediments from the southwest or northeast regions of Daihai Lake had the low Phosphorus release risk. (4) The release risk of endogenous phosphorus was high because of the high NAP content and pH values in sediments from the center region of Daihai Lake. According to the regional characteristic of phosphorus release in Daihai Lake, the weight combination method could be used for the endogenous phosphorus prevention and control. The center region of Daihai Lake with high phosphorus release risk should be prevented and controlled focally.