In order to protect and repair bronze drums, optical microscopy and scanning electron microscopy with energy dispersive Xray (SEMEDX) were used to analyze six bronze drums from Shanglin County, Guangxi. These drums are dated to a period from the Eastern Han Dynasty to the Southern Dynasties. The studies suggested that 1) these six bronze drums are made from a CuSn Pb alloy; 2) they were made by casting molding; 3) the modeling methods include both the mud and lost wax methods. This is the first report on the alloy composition and casting method used for cold water washed bronze drums. Therefore, this paper provides information for future research on the technology of bronze drums of a similar type.