The data journal policies are the foundation to promote the sharing and utilization of research data, and the investigation and analysis of foreign data journal policies are conducive to the research and formulation of data journal policies in China. Based on the data lifecycle model, this paper uses literature research and website research methods to analyze the content of data policies of foreign pure data journals in the period of data planning, data validation, data description, data preservation, data integration and utilization. China's data journal publication should establish data journal policies based on the life cycle of research data, cooperate with data repositories and libraries, pay attention to safeguarding the author's rights and interests and encourage the data citation according to international standard format.