Aided by elevation information provided by height sensor, SAR (synthetic aperture radar) platform geo-location was realized by combining the high-precision image matching technology and the INS (inertial navigation system) drift correction method. According to the fact that the platform is on the centerline of SAR image at the middle imaging time, some points on the centerline of a single image were equably selected to conduct the high precision matching with the optical reference image. The projection position of SAR platform on the horizontal plane was calculated and the spatial position was positioned by making use of the elevation information. By use of the position results of sequence images, the drifting parameters of INS were estimated and then the outputting position data were corrected to achieve the high-accuracy platform geo-location. The impacts of different errors on location precision were analyzed and the precision estimation formulas were derived. Both simulation and real data test results show high precision and practical value for engineering of the proposed method.