Method 1: PURGE command slimming method First save CAD graphics files, then execute PURGE command to clean up redundant data. Cleaning here will clean up useless blocks and layers, linetypes, fonts, sizes and styles without entities. You can perform two or three purges, and if you add more before purging, it will be cleaned more thoroughly. Method 2: WBLOCK command slimming method first saves the CAD graphic file, and then generates a new graphic file in the form of blocks for the graphics to be transmitted, and takes the newly generated graphic file as transmission or archive. Execute the command: wblock, enter the file name and file storage location to be saved, and then define the name: (Enter directly), give a base point: (Select any point), and select the object: (Enter after selection), so as to generate a new graphic file in the specified folder, and the file weight reduction is successful.