Abstract: Using BeiDou Satellite Based Augmentation System (BDSBAS) messages, precision ephemerides, International GNSS Service (IGS) ionospheric total electron content (TEC) files, and IGS station observation files as experimental data, the ionospheric residuals in the BDSBAS grid points and in the pseudorange of the stations are calculated to evaluate and analyze the performance of the correction of BDSBAS ionospheric errors. Using the observation data from domestic IGS observatories, the tilted ionospheric error at the ionospheric pierce point calculated by the BDSBAS message is similar to that calculated by the dual-frequency method, with a residual difference of about 2 m, and the residual difference is basically below the boundary of the error calculated by the BDSBAS message, which indicates that the BDSBAS ionospheric correction meets the expectation. Finally, the flight trajectory of the approach section of the aircraft is simulated, and the ionospheric residuals at the nearest observatory’s ionospheric pierce point corresponding to the aircraft position are taken as the reference value, so as to provide a method for the assessment of the ionospheric correction of the on-board receiver.