Abstract: The Xianghai Wetlands Nature Reserve (122?05'-122?31'E, 44?55'-45?09'N) was situated in the western border of the Songnen Plain in Northeast China. It has been listed in the List of Wetlands of International Importance since 1992 (Ramsar site No. 548). As downstream freshwater wetlands of the Huolin River, the Xianghai Wetlands, covering an area of 360 km², located at parts of the semi-arid climatic zone and border with the Keerqin Desert. Except for rainfall, the main hydrological inputs (about 55.2%)of the Xianghai Wetlands were from the Huolin River. The Huolin River originated from the Da Hinggan Mountains, flowed about 320km, and lost its watercourse and end at the Xianghai riverine wetlands. Xianghai Wetlands were located at transition zones of terrestrial and aquatic ecosystems, where they received sediment inputs from both systems. Accumulative sediments during marsh development really recorded the region environment change and marsh processes. Here we reported a case study on the Xianghai marsh wetlands at downstream of an interior river-Huolin River. By segmented sample with centimeter and assorted with ¹³⁷Cs, ²¹⁰Pb age measure, high-resolution analyzed sediment element geochemistry in two typical sedimentation cores. Through analysis of ratios of elements in the typical sedimentation profile, the following results are revealed: the ratios of Sr/Ba, Rb/K, and (CaO+K₂O+Na₂O)/Al₂O₃ are good indicators to diagnosis salinization and climatic change between the arid and the humid. The salinization in this area not only is occurred in recent several decades, but is long-standing, however, human activities have enforced the progress and periods of salinization in recent years. Too much vibration has occurred between cool arid and warm humid during the recent 240 years in the Houlin River catchments.