Fresnel structure makes the aperture of the liquid crystal lens greatly increased, while maintaining a faster response speed and a larger adjustable range of focal power. In this paper, the characteristics of a Fresnel liquid crystal lens with an aperture of 2 cm are tested. The Mach-Zehnder interference optical path for testing the lens is optimized, and a clear and complete interference image is obtained. Through analysis and calculation, the focal power of the lens can be adjusted in the range of -1 D?1 D, and the root mean square aberration of the central Fresnel region is less than 0.11λ. The diffraction spot distribution of the lens is tested, and the imaging system after adding the liquid crystal lens is quantitatively analyzed. The resolution of the imaging system is obtained, and the zooming imaging function of the lens is verified. Test results show that the lens has a wide range of focusing ability and good imaging quality.