Depositing ages of sediment in core CK6 of Qarhan Salt Lake were determined by using methods of C-14, Th-230 and paleo-terrestrial-magnetism. Based on synthetic analyses for the variation of the content of organic carbon, sporo-pollen composition and lithofacies, the fluctuating model of paleo-climate since 750 ka B.P. was set up. It is divided into 21 fluctuating epochs of climate, among them, 11 are warm and humid epochs, and 10 are dry and cold epochs.