Base on the teleseismic waveform data recorded by 82 permanent broadband stations in Guangdong Province and its adjacent areas including in Fujian，Jiangxi，Hunan，Guangxi， Hainan，and Taiwan，we calculated body wave receiver functions under all stations，and obtained the crustal thickness and averaged Poisson's ratio beneath these stations by the H-κ stackingsearch method of receiver function． The results show the crustal thickness with an average thickness of 29. 5km in Guangdong Province and its adjacent areas ranges between 26. 8km and 33. 6km and gradually thins from Northwest to Southeast． The crustal thickness in Zhujiang Delta， western Guangdong，Nanning，and Nanao areas is relatively thinner and ranges between 25. 0km and 28. 0km． The minimum crustal thickness is about 26km beneath the Wengtian of Hainan and the Zhanjiang zone and Shangchuan Island of Guangdong． The crustal thickness in the zones of Mingxi，Fujian and Yongzhou，Hunan is thicker and varies between 31. 0 km and 34. 0 km． The distribution of Poisson's ratio in our study region ranges between 0. 20 and 0. 29． Poisson's ratio in southeast Hainan，the coastal areas of eastern Guangdong and western Fujian and southern Jiangxi has distinctly higher values than that in others． It suggests that the various geothermal fields are just located in these areas which have high heat flow values． The distribution of crustal thickness and Poisson's ratio have obvious block features and may be related to the distribution of faults and historical earthquakes．