According to the official website of the China Securities Supervision Commission, the China Securities Supervision Commission issued eight financial industry standards, including the Communication Guide for Blockchain General Infrastructure in Regional Equity Markets, and the Communication Guide for Blockchain General Infrastructure in Regional Equity Markets. The financial industry standard stipulates the communication guidelines between the general financial infrastructure and the existing systems of the regional equity market based on the two-layer architecture of the "chain of custody-local business chain", and clarifies the user registration protocol, asset registration protocol, fund mapping protocol, asset mapping protocol, transfer management protocol, settlement management protocol and other six types of communication protocols. Systems, main data objects, business scenarios and operation instructions involved. The formulation and implementation of standards is conducive to giving full play to the supporting role of the "chain of custody-local business chain" double-layer blockchain architecture on existing business systems, and promoting the transformation and docking of existing business systems.