Two-dimensional pointing mirror as well as detector array is often used in the searching and tracking system. Based on the vector theory of optical reflection,the imaging characteristics and scanning traces of the two-axis pointing mirror are studied. The relationship between image rotating angle and the pointer’s elevation and azimuth is analyzed in detail. When the pointer rotates around the axes which aren’t parallel to the pointer’s surface,the images on the detector rotate as well and the trace of the pointer is non-linear. Furthermore,the calculation methods for image rotation of detector array and the influence of rotation on the tracing system are also given.