Is Human Digital Twin possible?

While Digital Twin finds its applications in many fields, mainly in advanced manufacturing, PLM (Product Lifecycle Management), and smart healthcare, attempt of using Digital Twin in full lifecycle management of human being is discussed. The concept of Augmented Digital Twin is put forward as the basis of the concept of Human Digital Twin (HDT), which is the core idea of the paper. With the experiences of Digital Twin application in smart manufacturing, PLM and smart healthcare, and the development of other related technologies such as Data Mining, Data Fusion Analysis, Artificial Intelligence, especially Deep Learning and Human Computer Science, a conclusion can be drawn naturally, that HDT is an enabling way of full lifecycle health management and it is possible to construct Human Digital Twin, particularly from the technology view. Comparison between Digital Twin and Human Digital Twin demonstrates the possibility. The concept, conceptual model and characteristics of HDT are presented for preparation of its construction. How to construct Human Digital Twin is discussed by proposing Human Digital Twin System Architecture and Implementation Approach. Also, it is pointed out that there will be a long way to go because of not only its extreme complexity, but also so many aspects being involved, especially the security and social ethics problem.