Abstract: Using the 10th International Geomagnetic Reference Field(IGRF) models,the latitudinal distribution of harmonic amplitude and its time-variation of geomagnetic potential are investigated.The results indicate that the harmonic amplitude of the dipole component of geomagnetic potential is large in the Northern Hemisphere,small in the Southern,declining with time,which is fast in the Northern Hemisphere,slow in the Southern.And the changing rate periodicity is long in the lower latitude,short in the higher,as well as an average periodic variation of 60-year is available for the changing rate.The harmonic amplitude of the non-dipole component increases with time and more quickly in the Southern Hemisphere than that in the Northern,but not an apparent law of periodicity could be confirmed.A clear latitude-independence can also be obtained for the harmonic amplitude variation of geomagnetic potential,with its distribution and time variation on the north-south hemisphere is asymmetrical with respect to the Equator.