Body integrity identity disorder (BIID) is a rare delusion in which patients believe that a part of their body is not theirs and the only cure is amputation. Preliminary and secondary studies on the causes and past cases of BIID have shown that the disease occurs as early as childhood, that most patients are highly educated, and that the public does not accept the idea of ​​amputation.

This application uses mixed reality technology to achieve virtual replacement or transparency to meet the intrinsic needs of patients. This application allows patients to change their prostheses according to different occasions, weather, and clothing. In the virtual world, the prosthesis can be replaced as much as possible to make it feel real to the patient. The application software in the mall can be classified according to function, material, color, etc. To avoid the patient's inner loneliness, the application software can communicate and interact with the patient to increase the patient's privacy and social activities.