The sedimentary sequences superimposed by dune sand and paleosol are widely distributed in the southern part of Xinjian County, Nanchang. Based on the field investigation, we found the Houtian section mainly consists of the alternating deposition of 3 layers of dune sands and paleosol, and its top and bottom ages are 14.9 ka BP and 77 ka BP, respectively, which is the product of the last glaciation. According to the contents of grain size and OSL chronology, we got the conclusion as follows:(1) The strata of the Last Glacial Period in the Houtian section can be divided into five stages, as HTS4(77-57.1 ka BP), HTS3c(57.1-49.7 ka BP), HTS3b(49.7-36.8 ka BP), HTS3a(36.8-26.5 ka BP), HTS2(26.5-14.9 ka BP).(2) The two results extracted by particle size-standard deviation method and principal component factor analysis show that 12.619-20 μm is positively correlated with mean particle size and clay content, and 400-563.667 μm is negatively correlated with mean particle size and clay content, which inspects that the sensitive particle size of winter monsoon is 400-563.667 μm and the sensitive particle size of summer monsoon is 12.619-20 μm.(3)The mean particle size, clay content and sensitive particle size show remarkable variations in alternation of peaks and valleys. The warm periods mainly correspond to strong summer monsoon indicated by stalagmite in Hulu Cave in China, as well as the peak of total amount of astronomical insolation at 65°N in July, which reveals that the sand-paleosol is developed in the warm period of HTS3c, HTS3a and early HTS2. The cold periods mainly correspond to weak summer monsoon indicated by stalagmite in Hulu Cave in China, as well as the valley of total amount of astronomical insolation at 65°N in July, which reveals that the dunes sand is developed in the cold period of HTS4, HTS3b and late HTS2. The climate change in the Houtian section during the Last Glacial Period has a climate fluctuation of ten thousand years, which probably results from the mutual impact of total amount of insolation and East Asian Monsoon.
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