As a type of data, government data plays an important role in promoting local economic development and enhancing the government's service and governance capabilities. However, China's current government data open system cannot meet the demand for data openness under the development of the digital economy and the increasing needs of the growing society for production, life, and development. Although China has established a certain government information disclosure system, there are still some deficiencies in further constructing and improving China's data governance, promoting the development of the digital economy, and promoting digital ecological construction. On the one hand, the data openness system construction of local governments is polarized, with some regions taking the lead in institutional construction through local legislation, while other regions still have an imperfect government data openness system. On the other hand, the government data openness system in China still lags behind that of the United Kingdom and the United States, and the government information disclosure system, which focuses on the right to know, cannot effectively undertake the new government data openness system. To address these issues, effective legislative measures should be taken to regulate the objects, targets, and scope of government data openness, and to improve the system construction of government data openness in local governments in China.