GS1-based Unique Device Identity（UDI）is an informatic tool for tracking medical devices at all processes globally. The goal of establishing and applying UDI is to strengthen surveillance and managementof medical devices throughout its developing，manufacturing，logistic，and using process. UDI can be used in the field of production，circulation，stock management，usage，and post-market surveillance. The adoption of UDI can benefit regulators，manufacturers，distributors，healthcare providers，payers，and patients.