Abstract: Heavy metal mercury is a toxic trace element in coal-fired flue gas. Due to the atmospheric mobility and bioaccumulation,it is very easy to cause harm to ecosystems and human health. So heavy metal mercury has become one of the four major pollutants from coalfired flue gas. The synergistic mercury removal techniques by utilizing the conventional air pollution control devices( APCDs) has been increasingly studied in coal-fired power plants. The wet flue gas desulfurization( WFGD) device has become an important equipment for the removal of divalent mercury in flue gas with higher efficiency. However,the Hg2+absorbed by the WFGD device is released into the flue gas in the form of Hg0 under the action of reducing ions in the desulfurization slurry,which reduces the overall synergistic mercury removal efficiency of the APCDs. In this paper,the mechanism of mercury re-release in wet desulfurization slurry,the influencing factors,the principle of inhibiting mercury re-release and the research progress of mercury stabilizing additives were summarized. The effect of the desulfurization system operating parameters such as flue gas oxygen content,desulfurization slurry temperature,slurry p H,liquid-gas ratio,etc.,and coexisting ions such as SO23-,Cl-and Ca2+etc. on the mercury re-release behavior was elaborated; the classification and characteristics of additives that inhibit mercury re-release in the desulfurization slurry,as well as the chemical reaction mechanism and influencing factors of the interaction between the common additives and Hg2+was discussed; the latest research results of the mercury stabilizing additives by domestic and foreign scholars in recent years were summarized,such as the typical ones like H2 S,inorganic sulfides,halides,Fenton reagents and organic sulfur chelating agents DTC,TMT and STC etc. At the same time,The features of different additives,utilization condition,effects of mercury stabilization,and merits and drawbacks of them were analyzed. Some questions in the ongoing experimental research were surveyed and the directions for future improvement were proposed. It provides a reference for research and development on mercury re-release inhibition and mercury stabilizing additives in WFGD slurry.