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The article presents research on the spatiotemporal variability of the composition of organic carbon (OM) in suspended matter at the estuary and lower streams of the Amur River. It says that the suspended matter that precipitated on the Whatman glass fiber filters GF/F was examined on a mass-spectrometer at the International Arctic Research Center, University of Alaska in Fairbanks, Alaska. The results suggest that terrigeneous components dominated in the organic matter (OM) composition in the lower stream of the Amur River, while the proportion of the river plankton was secondary. It adds that suspended matter was characterized by the lightest composition of δ13C in the megasystem and the proportion of marine plankton reached 57% in the estuary.