Abstract: Accumulative sediments during marsh development really recorded the region environment change and marsh processes.A case study on the Xianghai marsh wetlands at downstream of an interior river-Huolin River has been conducted and ratios of specific elements in the typical sedimentation profile has been revealed on the basis of ¹³⁷Cs,²¹⁰Pb dating result. The ratio of dual stable elements Ti/Al can be served as a good indicator to determine whether original source of sediments came from the same provenance and the fluctuation of Ti/Al ratio represented the change of the original source of sediments that might be caused by flooding events. Totally the ratio of V/(V+Ni) is a good indicator to judge the oxygendeficient facies sedimentation environment of marsh wetlands. The sediments in Xianghai marsh wetlands is typically characterized by dysaerobic environment and much or less anaerobic or aerobic environment.Frequent vibration among them indicates the character of frequently change between arid and humid environment in periods of surface water downstream of an interior river in semiarid region.

Key words: ratios of elements, original source of sediments, oxygendeficient facies environment, marsh