Gaofen-3, the first high-resolution C-band multipolarization synthetic aperture radar satellite from China, has been in orbit for 5 years. It is significant for evaluating the positioning accuracy of Gaofen-3 products and determining the possibility of improvement. In this study, 338 Gaofen-3 images for six imaging modes from 16 test fields in China were selected, and 363 ground control points were used as independent checkpoints to verify positioning accuracy. The test results show that the average positioning accuracy of the six modes in the slant range direction was between −27.52 and −17.32 m. The average positioning accuracy of the six modes in the azimuth direction was between −17.21 and 2.4 m. The comparative experiments under the same imaging conditions demonstrate that the on-orbit state of Gaofen-3 is relatively stable. The internal electronic delay of the instrument and the azimuth “bistatic error” of the Gaofen-3 image rational function location model have not been eliminated. There is room for further improvement in the positioning accuracy of the Gaofen-3 standard product.