Abstract Based on the superconducting gravimetric observations at Yichang seismic station in 2017, we obtain the accurate local gravity tidal parameters of Yichang station by harmonic analysis of observation data after data preprocessing, polar motion correction and long-period trend correction. We select the NAO.99b and osu.Chinasea.2010 ocean tide models to study the influence of ocean tide loading on gravimetric observation. The results show that the amplitude change of ocean tide loading at Yichang station is about 25 nm·s-2, and the tidal parameters improve after ocean tide loading correction. We use the time-domain admittance method and global atmospheric model ERA-Interim to calculate the atmospheric loading effect of Yichang station. The results show that the atmospheric gravity admittance factor of Yichang station is -3.219 3 nm·s-2·hPa-1. The amplitude change of atmospheric gravity loading in the near region is about 160 nm·s-2, and can reach 70 nm·s-2 in the far region. The global atmospheric loading effect cannot be ignored when processing and analyzing superconducting gravimetric data.