Abstract: Big data, especially in the field of medical big data, is directly related to the life and health of human beings. With the development of big data and the acceleration of informatization, the rapid popularization of medical and health information platform and digital medical equipment and instruments has led to the explosive growth of data in the medical field, with various types and complicated relationships. Sensitive medical data security is also a matter of great concern. While medical data provide help for human health, the protection of related sensitive data has become a hot topic for scholars, practitioners and the general public. This article starts with big data’s basic concept, through the analysis to the current stage privacy leakage and the medical big data related research, unifies the big data domain correlation research to the current privacy leakage behavior, the protection technology and so on question carries on the classification elaboration. It is hoped that it will be helpful to the further research of scholars in this field.

Key words: big data, medical treatment, privacy disclosure, privacy protection