The purpose of this study is to survey the wooden parts and structures of double-layered eaves in traditional Korean timber buildings, and to compare them with similar parts and structures refered in official architectural documents of Chinese dynasties, such as Yingzaofashi(營造法式) from Northern Song dynasty and Gongchengzuofazeli(工程做法則例) from Qing dynasty. Double layered eaves are a kind of architectural design constituents for high-grade buildings. They are eaves that have additional superimposed eaves at the tip of normal single-layered eaves. Double-layered eaves are composed of many parts like eaves rafters(cheomaseokkarae 처마서까래), additional rafters(buyeon 부연), eaves connectors(pyeonggodae 평고대), rafter-gap-blockers(buyeonchakko 부연착고), tile supporters(yeonham 연함), etc. There are some variation of their framing, and they can be clues for comparative studies on East Asian architecture.