Abstract: In this paper,the continuous heavy-rains over upper reaches of the Changjiang during June-August are analyzed.They are closely related with the Indian Monsoon Systems.The average synoptic situations and the average distributions of some meteorological elements over Bengal Bay during the period of heavy-rain are exhibited.The correlation coefficients between the meteorological elements and the rainfall,the main Monsoon influence systems and the key regions are denoted,which may be used as a reference for the forecasting of rainfall in 24 hours.