In this paper, basic physics of quantum correlation imaging is introduced, with discussion on its properties of high sensitivity, robustness, efficiency of information acquisition, as well as the capability of single?pixel and lensless imaging. Towards its applications in Lidar, issues related to imaging of moving objects and influences from the atmosphere are discussed. By improving the sampling rate, enhancing the means of tracking and optimizing the strategy of imaging reconstruction, the application performance of quantum correlation imaging can be upgraded. The development direction of quantum correlation imaging lidar in fields such as scouting and early warning are prospected. Further improvements of the discovery probability, tracking accuracy, discrimination accuracy and effective working distance in the future by studying imaging technology under extremely low photon flux, optimizing design of illumination patterns, establishing cooperation among multiple systems, and developing algorithms including artificial intelligence and information fusion are expected.