Abstract: Th-230/U-234 and Th-227/Th-230 dating was applied to calcite and fossil bone samplesfrom Yanhui Cave, the site of Tongzi Man in Northern Guizhou. The age of the upper trave-rtine layer covering all cave deposits is 206 Ka. The flowstone and stalagmite, under third andfourth layer respectively, are of the age of 240 Ka. The fossil and artifact containing sediments,stratigraphically between these two speleothem formations, should be deposited in a late periodof Middle Pleistocene, and Tongzi Man should be classified as late Homo Erectus· The reliabi-lity of obtained results was discussed based on the stratigraphic evidences and on the intercom-parison between the results of two U-series methods.

Key words: Tongzi Man's site; U-series dating; Homo erectus