According to the present situation of government information utilization, this paper explores a new open sharing mode of government data, which can solve the core problems in the current open sharing mode of government information, such as insufficient interdepartmental information sharing, and poor practicability of citizens’ privacy information. By analyzing the defects of traditional models in the traditional information resource management centers, the feasibility in term of security opening and sharing upon the government big data based on blockchain is studied, and the security opening and sharing model upon the government big data is proposed. Combining the advantages of the traditional models, this model has four mechanisms such as sharing mechanism, high trust mechanism, strong security mechanism and contract mechanism, which can promote the benign interaction between multiple themes of government in terms of mutual trust and open sharing of information. Finally, taking the education department and the financial department as examples, the application is proposed in line with the actual situation and the blockchain technology. Taking education department, finance department and justice department as examples, according to their own characteristics and combining with block chain technology, we put forward systematic practical application method.