“Satellite Synthetic Aperture Radar Interferometry (InSAR), as a space to ground remote sensing observation technology that can work around the clock, has been widely used in terrain reconstruction, surface deformation extraction, and geological parameter inversion. The research progress of InSAR in the fields of interferometric phase unwrapping, surface 3D deformation extraction, and ionospheric error correction is introduced. The latest breakthroughs in high-precision terrain mapping and large gradient deformation observation are systematically analyzed, laying the foundation for the construction of InSAR error correction system.”