Abstract: Addressing the issue that the traditional precise clock offset products cannot be directly used for the third frequency of BDS triple-frequency uncombined precise point positioning (PPP) phase observations, this paper calculated the inter frequency clock bias (IFCB) using BDS-2 stations in the Asia Pacific region and BDS-3 stations in the global region and analyzed their time characteristics. Meanwhile, the positioning results of BDS triple-frequency uncombined PPP corrected using the calculated IFCBs and CNES Bias products were compared. The results indicate that the magnitude of IFCB of BDS-2 is within 3 cm, and the magnitude of IFCB of BDS-3 is within 2 cm. Compared with no IFCB correction, the 3D positioning accuracy of BDS-2 triple-frequency uncombined PPP improved by 14.07% when using IFCB correction, and the posterior phase residual was reduced by 8.82%. However, the BDS-2 triple-frequency uncombined PPP corrected by CNES’s Bias product is getting worse in both positioning accuracy (4.94% reduction) and posterior phase residual (2.94% increase). The improvement effect of BDS-3 triple-frequency uncombined PPP positioning accuracy corrected by CNES’s Bias product (23.02%) is better than that corrected by IFCB product (5.28%), and the posterior phase residual of the two correction methods is basically equivalent to that without correction.