Marginal sea is an ideal area for studying the interaction of ocean and continent,and its sediment has recorded valuable information of climate and tectonic change.As an important part of Chinese marginal sea,previous researchers have systematically conducted magnetic and paleoclimatic studies on sediments of the Bohai Sea.However,due to complex environmental influences,the magnetic variation mechanism of the Bohai sediments is complicated.In this paper,we study magnetic properties of BH08 core sediments from the Bohai Sea.The core BH08 was drilled to a depth of 212.4 min the central Bohai Sea with water depth of~25 m.Magnetic measurements were carried out on selected samples,mainly including the magnetic susceptibility (,massspecific), hysteresis loop,acquisition curve of isothermal remanent magnetization (IRM),the first-order reversal curve(FORC)diagram,temperature dependent curves of magnetic susceptibility(- Tcurve)and low-temperature remanent magnetization curves.Results indicate:1)the main magnetic minerals in sediments are magnetite and greigite,along with some high coercivity minerals such as hematite;2)magnetic variations are complicated,and are controlled mainly by the fluctuation of sea level according to the correlation between magnetic parameters and S/Cl value,redness(a*) anddelta18 O;3)greigite has been spotted in some layers,which indicates rapid changes in the depositional environment.Based on the high resolution chronology from Yao et al.(2014),we discussed the variation mechanism for magnetic proxies and its environmental implications,which are significant for the following environmental studies in the area.