利用197 -2014年GLDAS-CLM（Global Land Data Assimilation System-the Community Land Model）地表参量数据集、 中国区域逐日观测资料格点化数据集（CN05.1）和ERA-nterim大气环流再分析数据， 研究青藏高原5月（春季）土壤湿度的异常变化特征与6月高原地表热通量的相关关系以及土壤湿度异常与我国夏季（7月）降水的联系和可能机理。结果表明： （1）1979 -2014年5月青藏高原0~10 cm区域平均土壤湿度异常偏高年有2000， 2001， 2004， 2005， 2006和2013年； 异常偏低年有1994， 1995， 1996， 1998和1999年。高原整体土壤湿度2000年前较2000年后干燥。从空间分布来看， 藏北高原、 三江源地区以及藏南谷地土壤湿度偏高年较偏低年有明显增加， 且结果通过了90%的置信度检验。（2）高原5月土壤湿度的异常变化与中国夏季的降水分布存在明显的相关关系， 当青藏高原土壤较为湿润（干燥）时， 从高纬至低纬地区， 相关区呈现“正负正负”（“负正负正”）带状分布特点。（3）5月高原土壤异常湿润时， 6月高原东部感热通量和西部的潜热通量异常增加， 其共同作用会加强其大气低层辐合环流和大气高层辐散环流， 使整个东亚中高纬地区850 hPa以上受强反气旋环流控制； 高原东北部500 hPa及以上为反气旋环流， 南部和西部为气旋性环流， 环流场配置会使南亚高压加强东移， 加强西太平洋副热带高压。（4）7月西太平洋副热带高压北侧黄淮地区伴有垂直上升运动， 暖湿气流与东北冷涡西侧南下的干冷气流汇合， 高层辐散配合低层辐合有利于黄淮地区降水。西北东部和华北区域由反气旋性环流控制， 伴有较强的下沉运动， 空气干冷， 无充足的水汽输送， 不利降水产生。

Using 1979 -2014 Global Land Data Assimilation System-the Community surface parameter data set， China regional daily observation data grid data set （CN05.1） and ERA-interim reanalyze atmospheric circulation data.To study the relationship between the abnormal soil moisture in the Qinghai-Xizang Plateau in May and the surface heat flux in June and the precipitation change in July.The results show that： （1） From 1979 to 2014， the average soil moisture in the 0~10 cm layer area in May was abnormally high years were： 2000， 2001， 2004， 2005， 2006， 2013； the abnormal low years were： 1994， 1995， 1996， 1998， 1999.Soil moisture increased after 2000.Soil moisture increased after 2000.The soil moisture in the higher Tibetan Plateau， the Three Rivers Source Region， and the southern Tibetan valley is significantly higher than in the lower years.The results passed the 90% confidence test.（2） There is a clear correlation between the abnormality of soil moisture in spring and the distribution of summer precipitation in China.When the soil is wet （dry）， from high latitude to low latitude， the relevant area is "+ - + -" （"- + - +"） banded distribution.（3） The soil is moist in May， and the sensible heat flux in the east and the latent heat flux in the west increase in June.Their combined effect strengthens the convergent circulation of the lower atmosphere and the divergence circulation of the upper layer， so that the East Asia region is controlled by the strong anticyclone circulation above 850 hPa.The 500 hPa and above in the northeast of the plateau is an anticyclone circulation， and the south and west are cyclonic circulations.This circulation field configuration makes the South Asian high pressure move eastward and the Western Pacific subtropical high pressure.（4） In July， the Huanghuai area on the north side of the Pacific High has a vertical upward movement.The warm and moist air flow converges with the dry and cold air flow on the west side of the northeast cold vortex.High-level divergence and low-level convergence are conducive to precipitation in Huanghuai area.The eastern northwestern and northern China regions are controlled by anticyclonic circulation， with strong sinking movement， dry and cold air， and insufficient water vapor transport， which is unfavorable for precipitation.