Abstract: The paper based on the environmental characteristics revealed by concent-ration of constant element oxides and ratio, and combined with ¹⁴C dating, researching the aeolian sedimentary sequence of desertified land in the MS profile of Gonghe Basin, and rebuilt the sedimentary environmental evolution process of Gonghe since 1.2×10⁴ cal BP. The research result shows that SiO₂、Al₂O₃ is the main element oxide in the profile, and the order of element content is SiO₂ > Al₂O₃ > Fe₂O₃ > MgO > CaO > Na₂O > K₂O. The ration of the constant element oxides indicated that the climate of the Gonghe Basin had changed in temperature cycle from cool-dry-warm-humid-cool-dry-cool-humid-warm-cool-warm-moisture-cool-dry since 1.2×10⁴ cal BP. Based on the environmental characteristics revealed by concent-ration of constant element oxides and ratio sand combined with ¹⁴C dating, the environmental evolution in the MS profile since 1.2×10⁴ cal BP can be divided into seven stages. Before 1.198×10⁴ cal BP, the climate has become cool-dry with strong winds prompted intense aeolian activities so the Gonghe Basin had experienced a strong sandstorm activity period with weak pedogenesis; The climate trended to be warm with frequently climatic fluctuations and the pedogenesis instability in 11.98×10³-9.75×10³ cal BP; From 9.75×10³ cal BP to 8.09×10³ cal BP, cool and dry, the activity of sandstorm was strong and the role of forming soil was the weakest; During 8.09×10³-4.78×10³ cal BP, the climate was suitable and the pedogenesis was stronger; From 4.78×10³ cal BP to 2.90×10³ cal BP, cool and dry, the role of forming soil was weak; The climate was warm and wet, and the pedogenesis was the strongest and accompanying with prominently developed paleosol in 2.90×10³-0.67×10³ cal BP; The climate of 6.7×10 cal ka BP was cold and dry, and the role of forming soil was poor.

Key words: constant elements, mobility ratio, pedogenic environment, Gonghe Basin