The establishment of credit system based on blockchain technology in Guangdong-Hongkong-Macao Greater Bay Area (GHMGBA) is a modern and new digital co-governance credit model under the mode of social co-governance. Under the impact of global fintech innovation, the economic and social development needs to establish a new co-governance credit model to replace the traditional indirect credit model. In this paper, distributed security authentication technology, artificial intelligence technology, security of cloud storage technology and big data processing technology are effectively combined with blockchain technology, to establish a distributed and co-governance credit system, and to realize the credit records, credit investigation, credit collection, credit evaluation, and to realize automation and intelligent of the whole management of credit system, to realize the advantages of high distribution, high availability, tamper-proof, verifiability, high scalability, openness and sharability of credit information , to provide innovation and development paths for green, inclusive and intelligent financial services.