Abstract: Analysis of grain sizes* chemical eljements and calcium cardonate in some stratum of the pulu Profile and the research results showed that The Taklamakan Desert had expanded to the present border where the sandy mountains occupied at least since early and middle Pleistocene? About 67000-63000 years ago the desert sediments had only an insignificant fluctuation, since then It was getting sronger. Since last glacial period the climate become dry and cold on the whole and no obvious evidence of climatic fluctuation occurred-Its dry and cold extents beyond that of the loess depositional period in the middle reaches of the Huanghe River,