High resolved imaging and superresolved imaging technologies are the hot topics in the electronicoptical tracking, optical remote sensing and the aerospace industry. With transforming an optical imaging system into an electronicoptical imaging one, how to improve the geometric resolution of CCD has become an important problem to develop the high resolution electronicoptical imaging system. In this paper, several methods to realize high resolved constructions are introduced based on theoretical analysis and engineering practice. Then, two kinds of image construction technologies, micro scanning and subpixel, are described, and their shortcomings are discussed in detail. Furthermore, to improve the band width by reconstruction without the spectral alias in supperresolution technologies, a new coding technology combining a optical encoding and the subpixel method is proposed. With the method, the bandwidth has been amplified by three times as compared with that of traditional methods. From what has been discussed above, it comes a conclusion that an optical imaging system combined optical, electronicoptical and signal processing technologies will be an important developing trend.