Diffractive optical systems are promising in large aperture lidar receiver applications. The negative dispersion effect on lidar image quality caused by the diffractive primary lens was analyzed. Two chromatic aberration correcting methods, inserting high dispersion glass and adopting Schupmann theory, were discussed. An achromatic system based on Schupmann theory was lightweight, and provided perfect image quality. And the system light transmittance was over 60% . A design of lidar receiver optical system with 1m aperture and 1 mrad max FOV was demonstrated, and the system f/# was 8. The image quality attained diffraction limit approximately.