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The article presents a study on the impacts of the Indian Ocean basin-scale sea surface temperature anomaly (SSTA) on the onset of the summer monsoon on South China Sea. It is observed that basin-wide warming in tropical Indian Ocean occurs after an El Niño event. Changes in the sea-surface temperature sustain the El Niño-Southern Oscillation (ENSO) effects towards the summer monsoon in Asia and modifies the strength of the Philippine Sea anti-cyclone, which causes delay to the South China Sea monsoon onset. The methods and the conclusion of the study are discussed.