By using the NCEP/NCAR reanalysis data, the anomalous features of the northeast cold vortex and relationship between it and rainfall in the Huaihe River valley in summer from 1960 to 2009 was analyzed. It was found that stronger northeast cold vortex possibly related to more rainfall in the Huaihe River, and vice versa. 2003 was chose as a strong northeast cold vortex year, and a heat source was artificially added in the numerical studies. As a result of that, different southeast airflow occurred in high levels, and difference northwest airflow in low levels. This circulation situation was not conducive to high-level cold air and the low-level warm and humid air joined over the Huaihe River valley, therefore the precipitation over the Huaihe River valley deceased. The formation mechanism of rainfall reaction over the Huaihe River valley in the northeast cold vortex was found that it was abnormal warm in the Northeast-the Korean Peninsula-the ocean east of Japan in strong NECVI years, which made more obvious sea-land thermal contrast in the 35°-N50°N and caused abnormal summer monsoon circulation systems. The anomalies resulted in abnormal more precipitation over the Huaihe River valley, and vice versa.
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