Abstract: The 230^Th/^234U ages of travertin in the New Cave are as follows: 179 Ky., 139 Ky., 128 Ky.and 88 Ky. B.P.. So the New Cave was formed at 200 Ky. B.P., while thehuman activity hasbegun there. This age is roughly in accordance with the upper limit(230-- -260 Ky.) of thehuman activity in the lst place of the Peking Man Site.
The ages of growing of the stalagmite and stalactite in New Cave are about80--50 Ky.B.P.. At more than 70 Ky. B.P. the paleotemperature was 13.2℃(stalactite sample) and 13.7℃(stalagmite sample); at 55 Ky. B.P., the paleotemperature decreased to 11.9℃judging from thestalagmite sample. .

Key words: Zhoukoudian Longgu hill; Speleothem; Uranium-series dating; Paleotemperature