The spatial distribution of summer precipitation in eastern China in 2015 shows a reverse phase relationship between north (Hetao area,HT) and south (the middle and lower reaches of Yangtze River Valley,YRV).The precipitation anomalies in HT and central India (CI) are below-normal,while those are above-normal in YRV.The absolute maximum of summer precipitation anomaly percentage in the above three areas in 2015 is more than 55%.The formation mechanism of precipitation anomalies in East and South Asia during boreal summer of 2015 is mainly due to the development phase of El Niño event at the same time.An anticyclone circulation anomaly in the Philippine Islands and its adjacent regions,a cyclone circulation anomaly in the Yangtze-Huaihe region to the Japanese archipelago,and the geopotential height anomaly field in the lower troposphere and the water vapor transport anomaly field in the whole troposphere also have the same spatial distribution,which also reveals the spatial distribution of negative EAP (East Asian-Pacific)/PJ (Pacific-Japan) teleconnection.It is beneficial to less precipitation in HT and more precipitation in YRV.The tropical Pacific SSTA weakens the Walker circulation in the tropical region,which contributes to the descending motion over the western tropical Pacific.The abnormal tropospheric easterly prevails in the tropical Indian Ocean,which weakens the Indian summer monsoon and results in below-normal precipitation in CI during boreal summer.Meanwhile,the lower troposphere over India is controlled by an anomalous anticyclone.The westerly anomaly on the northern side of the anomalous anticyclone moves eastward along the southern edge of the Tibetan Plateau,which enhances the anomalous water vapor transport associated with EAP/PJ teleconnection.Therefore,it is conducive to maintaining and strengthening the below-normal precipitation in HT and the above-normal precipitation in YRV.