Abstract: Based on the high-order geomagnetic field model NGDC-720-V3,the power spectrum method will be used to estimate Curie isothermal surface to study topography of the magnetic layer basement in Tarim Basin and adjacent areas.The result shows that the depth of Curie surface in the study area varies from 28 km to 48 km.The Curie surface in Tarim Basin correlates with terrestrial heat flow,and coincides with basement uplift and depression.Shallow parts of Curie surface extend in uplift zones of the basin correspond to high heat flow values.The correspondence of deep parts of Curie surface with low heat flow values are distributed along the depression zones.The shallow parts of Curie surface are in mountain areas,and the deep parts of Curie surface are in basin area.The Curie surface is shallower in uplift basin zones than the surface in depression basin zones.