A simple and rapid imaging system based on metamaterials and Compressed Sensing(CS) theory is designed, which can be used in millimeter wave and THz imaging with a simple structure and good portability in different frequency bands. The system has a single-channel imaging aperture composed of metamaterial structure Complementary Electric-LC(CELC) unit, then the information can be compressed on the physical layer. Because of the irrelevance of aperture's radiation characteristics under different frequencies, the frequencies are swept to achieve multiple measurements. By using the Two-step Iterated Soft Thresholding(TwIST) algorithm, the scenes are reconstructed. The imaging aperture designs of K-band and terahertz band are completed as well as the simulation test of imaging in K band. For a 40 cm imaging aperture, a range resolution of 4.6 cm and an angular resolution of 1.3° can be reached theoretically.