Abstract: Evidence from China is crucial in order to understand hominid evolution，with age dating being critical to interpret the evidence． Homo erectus fossils， including two skulls and a tooth，were discovered interbedded with cave deposits in the suburbs of Nanjing in 1993 and 1994, and are referred to as“Nanjing Man”．U/Th ages of the calcite flowstone overlying the Nanjing Man fossils are 533+_15 12ka or 533+-35 30ka，if considered accurately．The[231Pa/235U] activity ratio of the flowstone is 0.998±0.006．indicating concordance of U/Th and U /Pa ages ．A stratigraphically younger stalagmite gives an age progression consistent with the internal stratigraphy of the stalagmite：465+-45 35 ka；398±15 ka；350±10 ka；260±8 ka and 160±2 ka．Our data indicate that Nanjing Man is older than 500 ka．We analyzed five animal teeth from the Nanjing site by TIMS．U/Th ages vary from 185 to 290 ka and U/Pa ages from 137 to 172 ka．For both U/Th and U/Pa ages, the each age is less than that of the dentine for the same tooth．In addition，the U/Pa age of each tooth subsample is less than its U/Th age by 24～40％ ．Thus，these teeth do not follow an early uranium uptake mode1．In a[234U /238U]vs．[230Th/238U]diagram，the tooth data plot in a field between early U uptake(EU)and linear U uptake(LU) curves．This indicates a U uptake history between the EU and LU model，which has been the general consensus on uptake history for these types of samples．In this case, both U/Th and U/Pa LU model ages will be the upper limit of the samples ．However，the U/Pa age may give a better estimation be cause it is not affected by the possible variation of input 234U/238U ratios．The minimum U/Pa LU model age is 1 Ma, which gives a constraint on the upper limit of Nanjing Man age．Although possible，it is not conclusive that Nanjing Man lives in marine 16O isotope stage 16(MIS16)．