Abstract: The Hainan Island has long been considered as lacking the Jurassic deposition, which suggests that Hainan Island and interior continent have different Mesozoic evolutions. In this study, the authors conducted detrital zircon U-Pb analysis for the fuchsia clastic rocks in the Jianling and Hailuoling section and the Early Cretaceous Lumuwan Formation rocks, which are located at Sanya, southern Hainan. The zircon U-Pb dating results of the fuchsia clastic rocks from the two sections illustrate similar age spectra and oldest depositional age (172~174Ma). They are completely different from the spectrum of the underlying Late Ordovician Yuhong Formation and Early Cretaceous Lumuwan Formation samples. Together with previous tectonic and igneous activity records as well as the zircon Hf isotopic characteristics of the fuchsia clastic rocks, the authors hold that the deposition of the fuchsia clastic rocks in Jianling and Hailuoling must have occurred during 172~158Ma in the Middle-Late Jurassic periods. The sedimentary provenance and tectonic background were similar to those of the contemporary sedimentary rocks in eastern Guangdong and Fujian, indicating a uniform tectonic environment during the Middle-Late Jurassic in the southeast coastal area of South China.