Optical distortion is an important factor which can degrade angle measurement accuracy of optical measuring equipment with wide field of view. In this work, a new multiple-model correction method based on partition calibration was proposed. A corresponding experiment was performed, and its results validate that this method can effectively raise angle measurement accuracy of equipment. It is applicable to optical equipment with large-sized detector pixel, and it would provide practical support for ballistic measurement of automatic salvo multi-targets, high speed targets and large dynamic targets with high accuracy.