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Blockchain technology has now entered the 3.0 era with solutions of“Blockchain Plus Industry”. As a technological innovation and industry-leading region, the Guangdong-Hong Kong-Macao Greater Bay area has inherent advantages in the development of blockchain technology. How blockchain can lead the development of industry ecology in the future is a question worthy of our in-depth discussion. By analyzing the policy support and basic status of the Guangdong-Hong Kong-Macao Greater Bay Area, this paper sorted out the structure of the four-level characteristic development mode of blockchain technology, summarized the impossible triangle of technology, incompatibility issues, standard construction, supervision and other issues, and putforward relevant suggestions for the development of the blockchain in the Guangdong-Hong Kong-Macao Greater Bay area.