Abstract: 【Purpose/significance】Under the overall background of the national security concept,the construction of digital government puts forward higher requirements for data security.The opening and sharing of government data resources in the process of collabora⁃tive governance of government data poses a certain degree of security risks.The application of blockchain technology to the construc⁃tion of the government data open sharing platform can cope with the data security issues in the open sharing process,and further fully explore the value of government data,ensure data security and release data dividends【. Method/process】This paper uses the character⁃istics  of distributed,transparent,traceability and openness of blockchain technology to construct a government data open sharing plat⁃form,and studies its operating mechanism,taking carbon trading data collaborative governance as an example to explore the government under blockchain technology The value of the open data sharing platform in the collaborative governance of government data【. Result/conclusion】 The government data open sharing platform and operating mechanism based on blockchain technology will help strengthen the collaboration between government departments and non-government departments,and clarify the data standards,Issues of ownership,credibility,etc【. Innovation/limitation】Using blockchain technology to provide a strong data security guarantee for the col⁃
laborative governance and open sharing of government data under the background of the national security concept.