Abstract: When one-dimensional linear array is used for planar scanning imaging, if the unit of one-dimensional linear array receives signals at the same time, the synthesized two-dimensional cylindrical array is a semi-holographic array. For this semi-holographic array, existing conventional imaging methods is invalid. Virtual lens imaging is a new imaging technology. It is compatible with different technology systems and can be applied to imaging targets at far, medium, near and ultranear range. In order to solve the imaging problems of semi-holographic cylindrical array, the virtual lens imaging technology is studied based on the characteristics of semi-holographic array. A fast imaging algorithm for semi-holographic cylindrical arrays is proposed. Finally, the imaging simulation results verify the effectiveness of the new algorithm.