Abstract: The chemical composition of the surficial sediments in Jiaozhou Bay is essentially coincident with the average chemical composition of rocks in the influent water system region, approximately corresponding to that of intermediate rocks. Since Na, K,Ca, Mg and P occur in large amounts in sea water and seawater-organism circulatory system, the contents of these elements from the sediments in the Bay are considerably lower than the average content of those from the rocks in the influent water system region. Data obtained show that P and Al,Fe from the sediments have a positive correlation.One of the sibnificant characteristics of sediments in liaozhou Bay is that the contents of trace elements, Ga,Cr,V,Cu,Zn,Co,Ni,Sr,Ba and B are, in general, higher in the Bay than in any other bays and sea provinces of the world.The correlation analyses show that the elements just mentioned occur, in the main but in varying amounts,in clay minerals.Ga, Cr, Ba, Sr are related to illite, and Cu, Ni to montmorillonite. In addition, Cr, V, Co, Ni and B are associated with elastic constituents and authigenic minerals in sediments.Judging from the characteristics of the horizontal and vertical distribution of trace elements,it seems possible that Cr, V, Cu, Zn, Sr and Ba are derived from industrial pollution. And the determination of Cr content in influent industrial waste water shows that there does exist Cr contamination in sediments in the Bay.