Twenty-six samples, including ancient and modern San Cai, potteries and porcelains, were tested to study the influence of XRF experiments on TL dating of ceramics. TL ages were measured and compared using three experimental conditions: (1) general and routine, (2) after XRF experimentation on the sample body and (3) after XRF experimentation on the sample glaze. It was found that the influence of XRF experimentation on TL dating varies from sample to sample. For some samples, there was no influence on TL dating results; for some samples, the TL ages became older. However, the influence was not large enough to result in dating modern samples as ancient after XRF experimentation.