Based on the analysis of 14 trace chemical elements from the CGS3a segment that corresponds to the MIS3 in the Chagelebu section of the Badain Jaran Desert,Inner Mongolia,China,the paper found that the contents of different trace elements vary,and even greatly. Their distribution and average values are as follows:P, ranging from 215*10~(-6) to 844*10~(-6)(average 480*10~(-6));V,35*10~(-6)-100*10~(-6)(69.5*10~(-6));Cr,50*10~(-6)-102*10~(-6) (72.1*10~(-6));Mn,214*10~(-6)-1 794*10~(-6)(616*10~(-6));Co 12.4*10~(-6)-23.8*10~(-6)(16.6*10~(-6));Cu,7.2*10~(-6)-47.5*10~(-6)(22.7*10~(-6));Ni,28.2*10~(-6)-53.5*10~(-6)(39.8*10~(-6));Zn,20.6*10~(-6)-101.7*10~(-6)(56.7*10~(-6));Pb,9*10~(-6)-29*10~(-6) (18.3*10~(-6));As,0*10~(-6)-13.3*10~(-6)(2.7*10~(-6));Y,11.6*10~(-6)-29.6*10~(-6)(20.2*10~(-6));Zr,88*10~(-6)-230*10~(-6)(144.7*10~(-6));Nb 3.2*10~(-6)-11.4*10~(-6)(7.4*10~(-6));Ba,457*10~(-6)-689*10~(-6)(571.4*10~(-6)),respectively. The trace elements display obvious regulations in different sedimentary facies,the contents of P,V,Cr,Mn,Ni,Zn,Pb,Y,Zr,Nb, Cu and As are lower in the dune sands,but higher in the lacustrine facies;while the contents of Co and Ba show opposite trend:higher in the dune sands,and lower in the lacustrine facies. The lower values of the trace elements in the dune sands mainly indicate the effect of erosion,transportation and accumulation of East Asia winter monsoon under the cold-dry climate condition;whereas,the enrichment in the lacustrine facie is related to the specially low-lying location under the warm-humid climate background of East Asia summer monsoon. Therefore,the paper suggests that the trace elements cycles actually represent the climate cycles in the alternations between the East Asia winter and summer monsoons. The CGS3a segment has experienced at least 5 climate cycles of alternation in the East Asia winter and summer monsoons,which reveals that there exist millennium-scale climate changes in the overall warm-humid climate during the Late MIS3 period.