<p>Gravity field information in polar regions plays an irreplaceable role in fields such as geological research, resource exploration, and national defense. To address the systematic errors and computational singularities in polar strapdown airborne gravimetry, which caused by the convergence of meridians in the north-oriented strapdown inertial navigation system (SINS) mechanization at polar regions, this paper proposes a polar strapdown airborne gravimetry method based on the transverse coordinate system. By deriving the mechanization algorithm in the transverse coordinate system, this scheme establishes a rigorous scalar gravimetry model and optimizes the entire processing workflow from raw observation data to gravity anomaly determination. The experimental results demonstrate that while the gravimetry accuracy of the conventional scheme degrades significantly as the latitude increases, the transverse coordinate system scheme effectively eliminates such systematic errors. At the spatial resolution of 12.79km, the transverse coordinate system scheme improves the internal consistence accuracy of gravity anomaly repeat lines from 1.01mGal to 0.91mGal, and reduces the mean of intersection discrepancy from 1.32mGal to 1.10mGal. The results demonstrate that this scheme significantly improves the accuracy of strapdown airborne gravimetry in polar regions, providing an effective technical solution for the precise determination of the gravity field in polar regions.</p>