Abstract: In this paper, the main factors responsible for the occurrence of abnormal weather events over Guangdong province in August 1988 was analysed and discussed, and several correlation factors or precursors which might be considered as the predictors of such abnormality were suggested. The conclusions are as follows.The main cause for no damage-producing tropical cyclone ravaging Guangdong but a long period of rainy days and excess rainfall stil happened there was due to the anomalous atmospheric circulation over East Asia, i. e. , the position of both the mid-latitude westerlies and the western Pacific subtropical high pressure situated far southward (near 10 degrees latitude) from their normal. Under the influence of such a large-scale atmospheric circulation which resembled to the situation of deep spring or early summer, the local conditions around the western North Pacific and the Sorth China Sea were unfavorable for any development of tropical disturbance, whereas all those damage-producing tropical cyclones developed over eastern waters tended to take northward or recurving paths. On the other hand, the position of the monsoon rain band appeared on South China, much southward from its average.It was found that above-mentioned unusual atmospheric circulation systems and weather events were closely related to the anomalous SST of the equatorial eastern Pacific (SSTA), and the SSTA varied in precession. Furthermore, the variation of westerly circulation index over East Asia from April to July provided some precursors as well.. By investigating into these factors it is believed possible to make a qualitative pre-diagnosis on such kinds of atmospheric circulation and weather events.