Due to the marine climate and the soil environment of the Shenzhen area, the bronzes in the ancient tombs of Tiezaishan seriously corroded. In order to provide the scientific information for further conservation, the degree of corrosion of these unearthed bronzes was studied. Silver nitrate analysis, Xray fluorescence spectroscopy and Raman spectroscopy were employed to study the patinas on these bronzes. The results show that the main composition of patinas is malachite (CuCO₃·Cu(OH)₂). Sampleite (NaCaCu₅(PO₄)₄Cl·5H₂O) is also discovered on one bronze, which is rare in bronzes buried in moist soil environments. Moreover, nanocrystalline SnO₂ was found on the other bronze. This analysis provides experimental information relevant for the conservation of these bronzes, and also may be a useful reference for the conservation of other bronzes buried in Shenzhen area.