Based on monthly sea surface temperature (SST) data derived from HadISST, the tropical Indo-Pacific SST modes and their combination modes are studied, the results show that the positive abnormal precipitation appeared in the eastern tropical Indian Ocean and maritime continent and the Walker circulation weakened over Indo-Pacific region during eastern Pacific (EP) El Ni?o and symmetric central Pacific (CPⅠ) El Ni?o developing years, which results in the surface easterly anomalies off Java-Sumatra. Under the Bjerknes feedback, the abnormal easterlies lead to cold SST anomalies off Java-Sumatra, which is favorable for the formation of positive IOD events. Whereas, asymmetric central Pacific (CPⅡ) El Ni?o events are not related to the IOD events. And the relationship between SST modes and their combination modes over Indo-Pacific region and the autumn precipitation anomalies in the southern part of China were further investigated by composite analysis. The results show that during the single EP El Ni?o, single CPⅠ El Ni?o, the combination of EP El Ni?o and positive IOD (PIOD)，and the combination of CPⅠ El Ni?o and PIOD developing years, the autumn precipitation occurred positive anomalies due to the effect of warm and moist air from equatorial Indian Ocean and tropical Pacific. Under the Indi-Pacific region SST modes, the moisture which is related to the positive abnormal autumn precipitation in southeast China is contributed by the zonal transportation, except EP&PIOD modes. During EP&PIOD developing years, the western Pacific subtropical high (WPSH) further extended to the west resulting in the moisture transport north into southeast China along the southwest boundary of WPSH, therefore, the moisture which is related to the positive abnormal autumn precipitation in southeast China is contributed by the meridional transportation. Whereas, the autumn precipitation appeared negative anomalies in the southern part of China during CPⅡ El Ni?o developing years. In addition, during the single PIOD developing years, the positive abnormal autumn precipitation occurred in the southwest China and negative abnormal autumn precipitation occurred in the southeast China.