Using the daily surface precipitation data and NCEP/NCAR monthly reanalysis data over the period of 1961 -2020， the impacts and possible physical mechanism of the developing phase of eastern Pacific El Ni?o on the autumn extreme precipitation in China were examined.The results indicated that the eastern Pacific El Ni?o events exhibit significant impacts on the extreme precipitation over the central and southern China during the developing autumn， resulting in increased extreme precipitation in southern China and decreased extreme precipitation in central China.The involved physical process is explored.The result indicated that when the eastern Pacific El Ni?o is in the developing autumn， significant positive sea surface temperature anomalies （SSTA） are seen in the central and eastern Pacific， which are associated with anomalous ascent in the tropical central and eastern Pacific and anomalous sinking in the western Pacific.Associated with the SSTA， southern China is controlled by anomalous convergence， which creates favorable dynamic conditions for precipitation.In addition， anomalous anticyclonic circulation is observed from the South China Sea to the western Pacific， and the water vapor transport via the southwest flow is enhanced， which promotes the occurrence of extreme precipitation in southern China.As to the central China， however， it is characterized with anomalous northerlies wind and water vapor divergence， which is not conducive to the occurrence of precipitation.These results provide scientific clues for understanding the physical mechanism of extreme precipitation events in eastern China.