The health code is based on real data, which is declared by citizens on the Internet. After background review, the personal QR code can be generated. As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city. The introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly. On March 5, 2020, the draft of the Reference Architecture and Technical Guide for Epidemic Prevention Passwords was reviewed by the expert review meeting and formally submitted for approval. The promulgation of this standard provides technical specifications for the development enterprises of epidemic prevention codes, and regulates and requires the functions required for personnel management, authorization management and collection point management of epidemic prevention code users.