International security identification code (ISIN code) is a security coding standard formulated by the International Organization for Standardization (ISO), which was officially published in Securities and Related Financial Instruments-International Security Identification Code System (ISO6 166). Ф 61660 The main provisions stipulate the concrete coding formula of ISIN coding and the ShiWeiWei organization, and the coding covers financial instruments such as stocks, bonds, futures, options and certificates. The Extended Information ISO6 166 has been accepted by many international organizations in the securities industry, such as the 30-member Expert Group on Securities Registration and Settlement (G30), the Payment and Settlement System Committee of the Bank for International Settlements (CPSS), the International Organization of Securities Regulatory Commissions (IOSCO), and the International Association of Securities Managers (ISSA), etc., all regard the application of the ISIN Rules as a measure of a country or region. In terms of composition structure, ISIN code consists of 12 letters or numbers, which mainly includes three parts: country or region code with a prefix of 2 letters (ISO3166); ); The basic number is 9 letters or numbers, which are compiled by various countries and regions; The last 1 bit is the check code. The National Association of Coding Organizations (ANNA) is a global organization that implements and maintains ISIN coding. After applying to join Anna, a specific institution in a country or region can be responsible for compiling and maintaining ISIN codes for securities in that country or region.