The informatization of personal medical data is one of the key tasks of smart healthcare construction and how to securely store and share information, and make effective use of personal medical information has become a key direction for researches on smart healthcare. Based on the introduction of the development history of block chain technology in Bitcoin application field and the demand characteristic of safe storage of smart medical information, this study first analyzes the applicability of block chain for storage of personal health data, then proposes a solution scheme to realize the safe storage and sharing of smart medical information by using block chain technology, targeting individuals, doctors, and medical institutions, in which the interfaces of the network layer and application layer through algorithms are elaborated, and the personal medical information data is encrypted and stored in the block chain network to ensure that individuals have absolute read access to their own medical information.
