The interannual variability of heavy rainfall during the first rainy season in Huizhou and its circulation characteristics are investigated by using the daily precipitation data and NCEP/NCAR reanalysis data from 1967 to 2009. The results show that Huizhou is characterized by large amounts of total precipitation

heavy precipitation amount and rainstorm days. Heavy precipitation and rainstorm days are basically in agreement with the time series of the total precipitation. All of their tendency have little change. However

the anomalous heavy rainfall events tend to increase and intensify from middle 1990s up to the present. Coherent changes in atmospheric circulation are identified in tropical and midlatitude systems. Southerly (northeasterly) anomalies prevail over the low latitude region before and after the climate jump when heavy rainfall events increase (decrease) and intensify (weaken). However

northerly anomalies and cold air are responsable for the increase and intensification in heavy rainfall after middle 1990s. Moreover

with stronger updraft

convective instability

the heavy rainfall is favorable to form and increase after middle 1990s in Huizhou. The situation of decrease and weakening in heavy rainfall is accompanied by stronger northerly anomalies

weaker updraft and convective instability after middle 1990s.