///The depositional environment of the Pearl River Delta in the Late Quaternary and the spatio-temporal change in the climate are discussed on the basis of serial sampling and the results of sporo-pollen analysis of mangroves and accelerator mass spectrometry dating of samples. The profile of Dongchong in Panyu, Guangzhou is taken as a representative and associated with correlative profiles. The research results show that there were mangroves during the Late Pleistocene and Holocene in the Pearl River Delta. The mangroves are an indicator of transgression. The boundary of Holocene transgression can be traced according to the distribution of nine profiles for which the content of Rhizophora sporo-pollen is observed and five locations of buried rotted mangrove wood. Changes in the depositional environment can be divided into four stages on the basis of comprehensive analysis of the sedimentary cycle, dating of samples and the three curves of the contents of mangrove sporo-pollen, brackish fresh water diatom and hot warm species diatom in the Dongchong profile.