Fast focusing refers to the process of adjusting the position of the camera′s focal point,so that the image presented on the camera′s focal planereaches optimal clarity.In this paper,the commonly used climbing algorithm in currentlong focus lens rapid focusing techniques is introduced,and an improved fast positioning focusing algorithm incorporating radar data application is proposed.The fast positioning focusing algorithm leverages radar feedback distance information,offering advantages of fast focusing speed and high success rate,which optimizes the issue of time consuming full focal range extremum search in the traditional climbing algorithm.Through multiple tests with the device,it is found that the improved fast positioning focusing algorithm requires shorter time forfocusing and demonstrates better performance compared to the commonly used climbing algorithm.