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We have studied the zero-point offset of Gaia early Data Release 3 (EDR3)parallaxes based on a sample of 0.3 million giant stars built from the LAMOSTdata with distance accuracy better than 8.5\%. The official parallax zero-pointcorrections largely reduce the global offset in the Gaia EDR3 parallaxes: theglobal parallax offsets are $-$27.9 $\mu$as and $-$26.5 $\mu$as (beforecorrection) and $+$2.6 $\mu$as and $+$2.9 $\mu$as (after correction) for thefive- and six-parameter solutions, respectively. The bias of the raw parallaxmeasurements is significantly dependent on the $G$ magnitudes, spectral colors,and positions of stars. The official parallax zero-point corrections couldreduce parallax bias patterns with $G$ magnitudes, while could not fullyaccount the patterns in the spaces of the spectral colors and positions. In thecurrent paper, a spatially dependent parallax zero-point correction model forGaia EDR3 five-parameter solution in the LAMOST footprint is firstly providedwith the advantage of huge number of stars in our sample.

A spatially dependent correction of Gaia EDR3 parallax zero-point offset based on 0.3 million LAMOST DR8 giant stars