Stratigraphical research on Rb, Sr, Hg and TOC in Zhongba site, Chongqing indicates that Rb, Sr and Rb/Sr can reflect basically the process of climate change since 4250 a B.P., the major dry-cold periods can contrast to the low values of δ18 O curve in Dunde Glaciar, the high values of magnetic susceptibility and Ti curves from the settings in Huguang Maar Lake, the high values of 14C density in the atmosphere and the low values of relative long term variation on the solar activity, which response the characteristics that Rb and Sr in the stratums are not prone to be disturbed by mankind activities.Combining with archaeological remains and contrast the variation curves of Hg, P, Ca, Mg and TOC, we can still discover that Hg, P, Ca, Mg and TOC record three different stages of evolution that mankind activities go through since 4250 a B.P.Further studying, we think that the decline of salt industry site is probably interrelated with the palaeo-flood events, excessively utilizing the salt wells resources and the increased difficulty of using them.
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