The onsetpentad index and the drop-pentad index are independent with each other, which is favorable to the prediction of the anomalies of the circulation and precipitation of EASM.

• 江南春雨的建立时间和南海副高减弱时间之间又具有线性无关性，可以为东亚夏季风环流和降水异常的预报提供重要线索。