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We employ the corrected Gaia Early Data Release 3 (EDR3) photometric data andspectroscopic data from the Large Sky Area Multi-Object Fiber SpectroscopicTelescope (LAMOST) DR7 to assemble a sample of approximately 0.25 million FGKdwarf photometric standard stars for the 12 J-PLUS filters using the StellarColor Regression (SCR) method. We then independently validated the J-PLUS DR3photometry, and uncovered significant systematic errors: up to 15 mmag in theresults of Stellar Locus (SL) method, and up to 10 mmag mainly caused bymagnitude-, color-, and extinction-dependent errors of the Gaia XP spectra withthe Gaia BP/RP (XP) Synthetic Photometry (XPSP) method. We have also furtherdeveloped the XPSP method using the corrected Gaia XP spectra by Huang et al.(2023) and applied it to the J-PLUS DR3 photometry. This resulted in anagreement of 1-5 mmag with the SCR method, and a two-fold improvement in theJ-PLUS zero-point precision. Finally, the zero-point calibration for around 91%of the tiles within the LAMOST observation footprint is determined through theSCR method, with the remaining approximately 9% of tiles outside this footprintrelying on the improved XPSP method. The re-calibrated J-PLUS DR3 photometricdata establishes a solid data foundation for conducting research that dependson high-precision photometric calibration.

J-PLUS: Photometric Re-calibration with the Stellar Color Regression Method and an Improved Gaia XP Synthetic Photometry Method