Near–field imaging is an important application area of interference passive millimeter-wave imaging technology, and the array configuration is an important factor affecting the near–field phase error. In this paper, a 2–D synthetic aperture near–field imaging simulation system is built to implement functions such as target scene generation, near/far field forward simulation, image reconstruction, and near–field phase error correction. This system is utilized to quantitatively evaluate and analyze the near–field errors of different 2–D antenna arrays with the same spatial resolution. For the two–unit near–field scanning imaging test system, a self–calibration method is proposed to correct the receiver channel error and near–field phase error respectively. Compared with the near–field imaging method based on a reference point source, this method requires only a priori distance information and no need to image the reference point source, which bears the advantages of simple operation and fast imaging speed.