The invention discloses a modifiable medical digital specimen three-dimensional demonstration system comprising programs and files in chaining with the programs through numbers correspondingly. Standard SWFs (small web formats) are set in the bottom layers of the files; each standard SWF is provided with multiple same standard addresses for file storage. Each sub file and the standard SWFs included therein respectively correspond with one subject; contents of the subjects are in uniform formats adaptable to content forms. By the system, a series of modification operations such as adding, deleting, replacing, changing and/or updating can be executed conveniently, real-time modifying and updating can be achieved, industrial development and progress can be followed up in time, latest research achievements can be supplemented in time, and new case contents can be added in time. For example, once a new case or epidemic situation is found, related documents can be collected at once and handled into relevant theme content to be supplemented to the system.