Abstract: NGDC-EMM-720-V3 magnetic field modle provided by National Geophysical Data Center(NGDC) is used in this paper to compute the lithospheric magnetic field values of aftershocks distribution zones of Wenchuan earthquake,Lancang-Gengma earthquake and Tonghai earthquake.Using the lithoshperic magnetic field data we can draw magnetic anomaly maps.Analysis the relationship between the three earthquakes and their aftershocks epicenter distribution and lithospheric magnetic field.According to analysis,epicenters of three chosen earthquakes are in low magnetic anomaly areas.Lithospheric magnetic field values of aftershocks distribution zones are lower in general.The lithospheric magnetic field feature of Wenchuan earthquake and Tonghai earthquake are similar while Lancang-Gengma earthquake is differ from the other two earthquakes.