Introduction to ancient tombs: Hanging coffins, stone coffins, and boat coffins are all precious tomb monuments along the Yuanshui River. In particular, box rock hanging coffin burials have three coffin placement methods: wooden pile type, wooden pile frame type and cave type, with a distribution area of ​​11,000 square meters. Its discovery has important archaeological value for studying the funeral customs of local ancients, and provides new archaeological data for the study of Yuanshui culture. At present, most of the hanging coffins have rotted away, leaving only partial traces of their outlines.